Contract 0x995d38004314836e48485d5fe328ebc17046fe68

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0 CRO

CRO Value:
$0.00

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0x580824da3ae66fa84686d72868462d7e5684af618fbb0503429c0ece70600c86Swap Trait66812982023-01-27 5:38:236 hrs 12 mins ago0xb45c6bfb18bd516af6ceb3db34c1ce24852e75b3 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.4827572810050
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0x128a6c8df40b5ad18781a4d86bb4a15072cb61fbdfd4a0e4bf30e47bed881a91Swap Trait66784382023-01-27 1:08:0110 hrs 43 mins ago0x31a65f5d559fc3f1bea7798819640fe208d139b7 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.6084849466280
0x8776fadc4aa96072093e376bf5e50e5bfb5dc5fc209a1132bb75f6cee675f463Swap Trait66784312023-01-27 1:07:2110 hrs 43 mins ago0x31a65f5d559fc3f1bea7798819640fe208d139b7 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.5591028426540
0xcc32fcfdfbff025de531ac34e5f6c1b9ae5d6f961ca21399c0ac8fa98cb9a446Swap Trait66783962023-01-27 1:04:0210 hrs 47 mins ago0x31a65f5d559fc3f1bea7798819640fe208d139b7 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.43415933970
0x7a48d6ff061188d6d5539fadb1994b5663c5912804e73db78a8a854144b398fdSwap Trait66777362023-01-27 0:01:3111 hrs 49 mins ago0x31a65f5d559fc3f1bea7798819640fe208d139b7 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.6189993510450
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0x1defce31c9e6b0dbddd91d54db3657959442acfb1231129ce103589ffe2c4562Swap Trait66776382023-01-26 23:52:1511 hrs 58 mins ago0x31a65f5d559fc3f1bea7798819640fe208d139b7 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.4445189598470
0xd4871a77cd6af63bf2bed420ac14882d9baa45768ac7287119162f881580b966Swap Trait66775712023-01-26 23:45:5312 hrs 5 mins ago0x586217717c87469f2ea3d49443138f658ae83059 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.4345130556620
0xc4c80bcf960780b0a3f43a4e75e70c418151ebf41629963dd996da626690a11aSwap Trait66774702023-01-26 23:36:1512 hrs 14 mins ago0x586217717c87469f2ea3d49443138f658ae83059 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.5602701184760
0x35212064e7e9466696128ed0125e14e14103eb0a0c381e68f00cce7f8604dbfaSwap Trait66774652023-01-26 23:35:4712 hrs 15 mins ago0x586217717c87469f2ea3d49443138f658ae83059 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.4711546576920
0x9afb7499eb17e47f56d7c0488c177bb4bf212165080f9f43356bdb61f666b6cdSet Approval For...66762932023-01-26 21:44:4514 hrs 6 mins ago0x2f9c364918865983445bdd2ff0a6c8a2fcdf1d26 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.22447045770
0x9feec1194b3268e8d9b47080e3b7dd2d9825157e516d08eb1389763491578584Swap Trait66734052023-01-26 17:11:1518 hrs 39 mins ago0xd8d13e09635ed507ce17ef7554167c0023660b11 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.622502004731 4,827.567547872
0x7c4963a68a98ad5f69f84e8f7e6dec0d765a5e98da6e6f66720572fa9e56358eSwap Trait66733952023-01-26 17:10:1818 hrs 40 mins ago0xd8d13e09635ed507ce17ef7554167c0023660b11 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.531502505773 4,827.568018553
0xe6828e93dfd12f8524247afbf68ea83e144d8adf3da9e8749daa8df5d4a46db5Swap Trait66732702023-01-26 16:58:2918 hrs 52 mins ago0xd8d13e09635ed507ce17ef7554167c0023660b11 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.483638954874 4,827.573829987
0x5964edaf5b987de5c36b911dfd4fd24490c64559220cda842fe7e4a4273766ebSwap Trait66717022023-01-26 14:29:4921 hrs 21 mins ago0x3659eee4a15e303a5279b47745ce340a0f76aad2 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.620234908147 4,827.645011404
0x6cde87ebfd367123ed5563e7c1f81017860afe1ec280956a65777b670d0bf994Set Approval For...66716962023-01-26 14:29:1421 hrs 21 mins ago0x1707e251c00928ba91db6a87b8ecbbcf2ec617e6 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.2244802427650
0x912464d095c50002fa3c26850f25db854d4800f5ad811fb9eb947fbdfa98ee06Safe Transfer Fr...66716872023-01-26 14:28:2421 hrs 22 mins ago0x6217f156c86ddedaf661918f15decfd890641e24 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.423069976179 4,826.645707274
0x861222b7562657aa2c3c9d54b8eaa1a651f4d1a31602ac91aa711006098cd852Swap Trait66716722023-01-26 14:26:5821 hrs 24 mins ago0x6217f156c86ddedaf661918f15decfd890641e24 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO2.082974940904 4,827.646409247
0x0062b5a88788e95833f020dbf22d995faf22e5a128ae6eecbf04d0046f6b60f0Set Approval For...66716292023-01-26 14:22:5421 hrs 28 mins ago0x3659eee4a15e303a5279b47745ce340a0f76aad2 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.224550164387 4,826.6484188
0xfb45657002c77c6b5fc6ecb8a3812c7efad580572cce656365c609b781e2c205Set Approval For...66691512023-01-26 10:28:351 day 1 hr ago0x186b0d01b0260145ef1116d012fb94210d5758ba IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.224555517769 4,826.763488362
0x74cd02d2244804aed06e593920ab31c2f0e4cdbf4b4c464ba11cd9db9520b860Set Approval For...66690862023-01-26 10:22:271 day 1 hr ago0xea46cbee8fdb9f736d4b66e41b12a2ef903354ae IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.224555658725 4,826.766518174
0xe7fd3b4125505a11c62d895962983c4c0a567ea44905c3a14357da47e6fff511Set Approval For...66660002023-01-26 5:31:051 day 6 hrs ago0x337edf5a11e214e132d12a3e934006822728d3c8 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO0.224562349419 4,826.910332933
0x772d7d3c039f6e07b01c16a37673f91f0920cab62f20f5b3ff9e8ed873590319Swap Trait66655082023-01-26 4:44:321 day 7 hrs ago0x4c6e8f43ca290a5345244d23cec938b8c205c516 IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.405844244573 4,826.933028579
0x6c7768ea5934cdbf98fb676e22d2b9ddac2dabbd1d92471cbf3c3cb78dad7ae8Swap Trait66639112023-01-26 2:13:431 day 9 hrs ago0xe46ea9a517ba345a5395e2ca4fc6177b3a015dae IN  0x995d38004314836e48485d5fe328ebc17046fe680 CRO1.621505568380
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Contract Source Code Verified (Exact Match)

Contract Name:
Bed

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 22 : Bed.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./FixedComponent.sol";
import "./components.sol";

contract Bed is FixedComp {
    constructor(string memory uri) FixedComp(uri, "Boom Room Component Bed", "BRCbd", components.BED) { }
}

File 2 of 22 : withdrawable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access//Ownable.sol";

contract Withdrawable is Ownable {
    function withdraw() public payable onlyOwner {
        (bool success, ) = payable(msg.sender).call{
            value: address(this).balance
        }("");
        require(success);
    }
}

File 3 of 22 : util.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library util {
    function random(address addr, uint256 input) internal view returns (uint256) {
        return
            uint256(
                keccak256(
                    abi.encodePacked(
                        block.timestamp +
                            block.difficulty +
                            block.gaslimit +
                            block.number +
                            input +
                            ((
                                uint256(
                                    keccak256(abi.encodePacked(block.coinbase))
                                )
                            ) / block.timestamp) +
                            ((
                                uint256(
                                    keccak256(abi.encodePacked(addr))
                                )
                            ) / block.timestamp)
                    )
                )
            );
    }
}

File 4 of 22 : components.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library components {
    // fixed
    uint256 public constant WINDOW = 100;
    uint256 public constant DOOR = 101;
    uint256 public constant BED = 102;
    uint256 public constant BUILDING = 103;

    // not fixed
    uint256 public constant TABLE = 104;
    uint256 public constant DESK = 105;
    uint256 public constant ENTERTAINMENT = 106;
    uint256 public constant COUCH = 107;
    uint256 public constant PET = 108;
    uint256 public constant ACTIVITY = 109;

    uint256 public constant COSMETIC = 110;
}

File 5 of 22 : IComponent.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBoomRoomComponent {
    // mint random component with a single random trait on it
    // can only be called by BoomRoom contract
    // origin is the address that called BoomRoom contract
    // emits an event with the new component's metadata (ID, traits, score)
    // returns component type (e.g. windows, doors, bed etc)
    function mint(address origin, uint256 amount) external returns (uint256);

    // get the current traits of the component, and its total score, and whether the component is locked to a boom room
    function getComponentMetadata(uint256 component) external returns (uint256[4] memory, uint256, bool);

    function getScore(uint256 component) external view returns (uint256);

    // function getComponentTraits(uint256 component) external view returns (uint256[4] memory);
    // locks a component (i.e. to a boom room) - cannot swap traits when locked
    // returns total score of the component
    function lockComponent(address owner, uint256 id) external returns (uint256);

    // unlock component, transferring ownership back to owner
    function unlockComponent(address owner, uint256 id) external;

    // swaps traits between leftComponent and rightComponent.
    // validates that each trait in leftTraits and rightTraits already exists on EITHER leftComponent or rightComponent
    // emits an event with the new component's metadata (ID, traits, score)
    // function swapTraits(uint256 leftComponent, uint256[4] calldata leftTraits, uint256 rightComponent, uint256[4] calldata rightTraits) external;

    // removes trait (with type traitType) from fromComponent and puts it onto toComponent
    // ultimately burns original components and mints new ones
    function swapTrait(uint256 toComponent, uint256 fromComponent, uint256 trait) external;

    function componentType() external returns (uint256);
}

File 6 of 22 : FixedComponent.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./Component.sol";
import "./components.sol";

contract FixedComp is Component {
    constructor(string memory uri, string memory name, string memory ticker, uint256 componentType) Component(uri, name, ticker, componentType, 1470, 735, 367) { }
}

File 7 of 22 : Component.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access//Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/utils/ERC721Holder.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "./IComponent.sol";
import "../IBurnable.sol";
import "../util.sol";
import "./components.sol";
import "../withdrawable.sol";

abstract contract Component is Ownable, ERC721Enumerable, ERC721Holder, IBoomRoomComponent, Withdrawable {
    using Counters for Counters.Counter;
    Counters.Counter private tokenIndex;

    // trait types
    // WARNING: if any trait values are changed it can break getTraitType()
    uint256 public constant TRAIT_TYPE_1 = 1;
    uint256 public constant TRAIT_TYPE_2 = 2;
    uint256 public constant TRAIT_TYPE_3 = 3;
    uint256 public constant TRAIT_TYPE_4 = 4;

    // TRAIT_TYPE_1 traits
    uint256 public constant TRAIT_TYPE_1_TRAIT_1 = 101;
    uint256 public constant TRAIT_TYPE_1_TRAIT_2 = 102;
    uint256 public constant TRAIT_TYPE_1_TRAIT_3 = 103;
    uint256 public constant TRAIT_TYPE_1_TRAIT_4 = 104;
    uint256 public constant TRAIT_TYPE_1_TRAIT_5 = 105;
    uint256 public constant TRAIT_TYPE_1_TRAIT_6 = 106;
    uint256 public constant TRAIT_TYPE_1_TRAIT_7 = 107;
    uint256 public constant TRAIT_TYPE_1_TRAIT_8 = 108;

    // TRAIT_TYPE_2 traits
    uint256 public constant TRAIT_TYPE_2_TRAIT_1 = 201;
    uint256 public constant TRAIT_TYPE_2_TRAIT_2 = 202;
    uint256 public constant TRAIT_TYPE_2_TRAIT_3 = 203;
    uint256 public constant TRAIT_TYPE_2_TRAIT_4 = 204;
    uint256 public constant TRAIT_TYPE_2_TRAIT_5 = 205;
    uint256 public constant TRAIT_TYPE_2_TRAIT_6 = 206;
    uint256 public constant TRAIT_TYPE_2_TRAIT_7 = 207;
    uint256 public constant TRAIT_TYPE_2_TRAIT_8 = 208;

    // TRAIT_TYPE_3 traits
    uint256 public constant TRAIT_TYPE_3_TRAIT_1 = 301;
    uint256 public constant TRAIT_TYPE_3_TRAIT_2 = 302;
    uint256 public constant TRAIT_TYPE_3_TRAIT_3 = 303;
    uint256 public constant TRAIT_TYPE_3_TRAIT_4 = 304;
    uint256 public constant TRAIT_TYPE_3_TRAIT_5 = 305;
    uint256 public constant TRAIT_TYPE_3_TRAIT_6 = 306;
    uint256 public constant TRAIT_TYPE_3_TRAIT_7 = 307;
    uint256 public constant TRAIT_TYPE_3_TRAIT_8 = 308;

    // ACCESSERY traits
    uint256 public constant TRAIT_TYPE_4_TRAIT_1 = 401;
    uint256 public constant TRAIT_TYPE_4_TRAIT_2 = 402;
    uint256 public constant TRAIT_TYPE_4_TRAIT_3 = 403;
    uint256 public constant TRAIT_TYPE_4_TRAIT_4 = 404;
    uint256 public constant TRAIT_TYPE_4_TRAIT_5 = 405;
    uint256 public constant TRAIT_TYPE_4_TRAIT_6 = 406;
    uint256 public constant TRAIT_TYPE_4_TRAIT_7 = 407;
    uint256 public constant TRAIT_TYPE_4_TRAIT_8 = 408;

    uint256 public supplyOfAllTraits;

    uint256 public componentType;

    IBurnable scratchContract;
    function setScratchContract(address c) external onlyOwner {
        require(c != address(0), "null addr");
        scratchContract = IBurnable(c);
    }

    string public baseURI;
    function setBaseURI(string calldata uri) external onlyOwner {
        baseURI = uri;
    }

    struct traitMetadata {
        uint256 points;
        uint supply;
        uint256 traitType;
    }
     event newComponent(
        uint256 id,
        uint256 oldId,
        uint256 score,
        uint256 TRAIT_TYPE_1,
        uint256 TRAIT_TYPE_2,
        uint256 TRAIT_TYPE_3,
        uint256 TRAIT_TYPE_4,
        uint256 componentType
    );
    mapping(uint256 => traitMetadata) traitToTraitMeta;

    struct componentMetadata {
        uint256 TRAIT_TYPE_1;
        uint256 TRAIT_TYPE_2;
        uint256 TRAIT_TYPE_3;
        uint256 TRAIT_TYPE_4;
        uint256 score;
    }

    // tokenID => metadata
    mapping(uint256 => componentMetadata) componentMeta;


    uint256 seed = 100;
    function setSeed(uint256 newSeed) external onlyOwner {
        seed = newSeed;
    }

    uint256 public mintPrice = 1000000000000000000 * 10;
    function setMintPrice(uint256 newPrice) external onlyOwner {
        mintPrice = newPrice;
    }

    address boomRoomContract;
    function setBoomRoomContract(address br) external onlyOwner {
        boomRoomContract = br;
    }

    mapping(int => uint256) scratchUpgradeCosts;
    function setScratchUpgradeCost(int startingTraitCount, uint256 upgradeCost) external onlyOwner {
        scratchUpgradeCosts[startingTraitCount] = upgradeCost;
    }

    uint256[] traitsOrderedByInitialSupply = [TRAIT_TYPE_1_TRAIT_1, TRAIT_TYPE_1_TRAIT_2, TRAIT_TYPE_1_TRAIT_3, TRAIT_TYPE_2_TRAIT_1, TRAIT_TYPE_2_TRAIT_2, TRAIT_TYPE_2_TRAIT_3,
        TRAIT_TYPE_3_TRAIT_1, TRAIT_TYPE_3_TRAIT_2, TRAIT_TYPE_3_TRAIT_3, TRAIT_TYPE_4_TRAIT_1, TRAIT_TYPE_4_TRAIT_2, TRAIT_TYPE_4_TRAIT_3, TRAIT_TYPE_1_TRAIT_4, TRAIT_TYPE_1_TRAIT_5, TRAIT_TYPE_1_TRAIT_6,
        TRAIT_TYPE_2_TRAIT_4, TRAIT_TYPE_2_TRAIT_5, TRAIT_TYPE_2_TRAIT_6, TRAIT_TYPE_3_TRAIT_4, TRAIT_TYPE_3_TRAIT_5, TRAIT_TYPE_3_TRAIT_6, TRAIT_TYPE_4_TRAIT_4, TRAIT_TYPE_4_TRAIT_5, TRAIT_TYPE_4_TRAIT_6,
        TRAIT_TYPE_1_TRAIT_7, TRAIT_TYPE_1_TRAIT_8, TRAIT_TYPE_2_TRAIT_7, TRAIT_TYPE_2_TRAIT_8, TRAIT_TYPE_3_TRAIT_7, TRAIT_TYPE_3_TRAIT_8, TRAIT_TYPE_4_TRAIT_7, TRAIT_TYPE_4_TRAIT_8];

    constructor(string memory uri, string memory name, string memory ticker, uint256 compType, uint256 commonSupply, uint256 uncommonSupply, uint256 rareSupply) ERC721(name, ticker) {
        baseURI = uri;
        componentType = compType;
        scratchUpgradeCosts[1] = 30;
        scratchUpgradeCosts[2] = 45;
        scratchUpgradeCosts[3] = 60;
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_1] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_2] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_3] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_4] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_5] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_6] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_7] = traitMetadata({supply: rareSupply, points: 3, traitType: TRAIT_TYPE_1});
        traitToTraitMeta[TRAIT_TYPE_1_TRAIT_8] = traitMetadata({supply: rareSupply+1, points: 3, traitType: TRAIT_TYPE_1});

        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_1] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_2] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_3] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_4] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_5] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_6] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_7] = traitMetadata({supply: rareSupply, points: 3, traitType: TRAIT_TYPE_2});
        traitToTraitMeta[TRAIT_TYPE_2_TRAIT_8] = traitMetadata({supply: rareSupply+1, points: 3, traitType: TRAIT_TYPE_2});

        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_1] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_2] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_3] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_4] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_5] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_6] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_7] = traitMetadata({supply: rareSupply, points: 3, traitType: TRAIT_TYPE_3});
        traitToTraitMeta[TRAIT_TYPE_3_TRAIT_8] = traitMetadata({supply: rareSupply+1, points: 3, traitType: TRAIT_TYPE_3});

        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_1] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_2] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_3] = traitMetadata({supply: commonSupply, points: 1, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_4] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_5] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_6] = traitMetadata({supply: uncommonSupply, points: 2, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_7] = traitMetadata({supply: rareSupply, points: 3, traitType: TRAIT_TYPE_4});
        traitToTraitMeta[TRAIT_TYPE_4_TRAIT_8] = traitMetadata({supply: rareSupply+1, points: 3, traitType: TRAIT_TYPE_4});
        supplyOfAllTraits = (commonSupply*12) + (uncommonSupply*12) + (rareSupply * 4) + ((rareSupply+1)*4);

        // start token IDs at 1
        tokenIndex.increment();
    }

    function mint(address origin, uint256 amount) external returns (uint256) {
        require(msg.sender == boomRoomContract, "component mints must come from boom room contract");
        require(amount < 26, "must mint 25 at a time");
        for (uint256 i = 0; i < amount; i++) {
            (uint256 traitType, uint256 trait) = pickRandomTrait(seed + i);
            executeMint(origin, traitType, trait);
        }
        return components.WINDOW;
    }

    function adminMintWithTrait(address to, uint256 trait) external onlyOwner {
        executeMint(to, getTraitType(trait), trait);
    }

    function executeMint(address to, uint256 traitType, uint256 trait) internal {
            uint256 score = traitToTraitMeta[trait].points;
            uint256 curr = tokenIndex.current();
            _mint(to, curr);
            if (traitType == TRAIT_TYPE_1) {
                componentMeta[curr].TRAIT_TYPE_1 = trait;
                emit newComponent
    ({id: curr, oldId: 0, score: score, TRAIT_TYPE_1: trait, TRAIT_TYPE_2: 0, TRAIT_TYPE_3: 0, TRAIT_TYPE_4: 0, componentType: componentType});
            } else if (traitType == TRAIT_TYPE_2) {
                componentMeta[curr].TRAIT_TYPE_2 = trait;
                emit newComponent
    ({id: curr, oldId: 0,score: score, TRAIT_TYPE_1: 0, TRAIT_TYPE_2: trait, TRAIT_TYPE_3: 0, TRAIT_TYPE_4: 0, componentType: componentType});
            } else if (traitType == TRAIT_TYPE_3) {
                componentMeta[curr].TRAIT_TYPE_3 = trait;
                emit newComponent
    ({id: curr, oldId: 0,score: score, TRAIT_TYPE_1: 0, TRAIT_TYPE_2: 0, TRAIT_TYPE_3: trait, TRAIT_TYPE_4: 0, componentType: componentType});
            } else if (traitType == TRAIT_TYPE_4) {
                componentMeta[curr].TRAIT_TYPE_4 = trait;
                emit newComponent
    ({id: curr, oldId: 0,score: score, TRAIT_TYPE_1: 0, TRAIT_TYPE_2: 0, TRAIT_TYPE_3: 0, TRAIT_TYPE_4: trait, componentType: componentType});
            } else {
                revert("unexpected trait type");
            }

            componentMeta[curr].score = score;
            traitToTraitMeta[trait].supply--;
            supplyOfAllTraits--;
            tokenIndex.increment();
    }

    function lockComponent(address owner, uint256 id) external returns (uint256) {
        require(msg.sender == boomRoomContract, "only boom room contract can lock/unlock coponents");
        // if owner actually owns it, we know it's not locked
        require(ownerOf(id) == owner, "address is not owner of component");
        safeTransferFrom(owner, address(this), id);
        return componentMeta[id].score;
    }

    function unlockComponent(address owner, uint256 id) external {
        require(msg.sender == boomRoomContract, "only boom room contract can lock/unlock coponents");
        require(ownerOf(id) == address(this), "component is not locked");
        safeTransferFrom(address(this), owner, id);
    }

    string cannotOverwriteErrMsg = "cannot overwrite trait - must move it to another component";
    string fromNoTraitErrMsg = "from component does not have specified trait";


    function swapTrait(uint256 toComponent, uint256 fromComponent, uint256 trait) external {
        // TODO handle toComponent being 0
        require(ownerOf(fromComponent) == msg.sender, "caller does not own from component");
        bool toNewComponent = toComponent == 0;
        require(toNewComponent|| ownerOf(toComponent) == msg.sender, "caller does not own to component");
        uint256 traitType = getTraitType(trait);
        uint256 traitScore = traitToTraitMeta[trait].points;
        require(traitScore > 0, "invalid trait");
        componentMetadata storage toMeta = componentMeta[toComponent];
        componentMetadata storage fromMeta = componentMeta[fromComponent];
        componentMetadata memory newToMeta = toMeta;
        componentMetadata memory newFromMeta = fromMeta;
        int startingTraits = 0; 
        if (toMeta.TRAIT_TYPE_1 > 0) {
            startingTraits++;
        }
        if (toMeta.TRAIT_TYPE_2 > 0) {
            startingTraits++;
        }
        if (toMeta.TRAIT_TYPE_3 > 0) {
            startingTraits++;
        }
        if (toMeta.TRAIT_TYPE_4 > 0) {
            startingTraits++;
        }
        if (traitType == TRAIT_TYPE_1) {
            require(fromMeta.TRAIT_TYPE_1 == trait, fromNoTraitErrMsg);
            require(toNewComponent || toMeta.TRAIT_TYPE_1 == 0, cannotOverwriteErrMsg);
            newToMeta.TRAIT_TYPE_1 = trait;
            newFromMeta.TRAIT_TYPE_1 = 0;
        } else if (traitType == TRAIT_TYPE_2) {
            require(fromMeta.TRAIT_TYPE_2 == trait, fromNoTraitErrMsg);
            require(toNewComponent || toMeta.TRAIT_TYPE_2 == 0, cannotOverwriteErrMsg);
            newToMeta.TRAIT_TYPE_2 = trait;
            newFromMeta.TRAIT_TYPE_2 = 0;
        } else if (traitType == TRAIT_TYPE_3) {
            require(fromMeta.TRAIT_TYPE_3 == trait, fromNoTraitErrMsg);
            require(toNewComponent || toMeta.TRAIT_TYPE_3 == 0, cannotOverwriteErrMsg);
            newToMeta.TRAIT_TYPE_3 = trait;
            newFromMeta.TRAIT_TYPE_3 = 0;
        } else if (traitType == TRAIT_TYPE_4) {
            require(fromMeta.TRAIT_TYPE_4 == trait, fromNoTraitErrMsg);
            require(toNewComponent || toMeta.TRAIT_TYPE_4 == 0, cannotOverwriteErrMsg);
            newToMeta.TRAIT_TYPE_4 = trait;
            newFromMeta.TRAIT_TYPE_4 = 0;
        }
        newToMeta.score += traitScore;
        if (newFromMeta.TRAIT_TYPE_1 != 0 || newFromMeta.TRAIT_TYPE_2 != 0 || newFromMeta.TRAIT_TYPE_3 != 0 || newFromMeta.TRAIT_TYPE_4 != 0) {
            newFromMeta.score -= traitScore;
            uint256 newFromComponent = tokenIndex.current();
            tokenIndex.increment();
            mintFromMeta(msg.sender, newFromComponent, fromComponent, newFromMeta);
        }
        uint256 newToComponent = tokenIndex.current();
        tokenIndex.increment();
        mintFromMeta(msg.sender, newToComponent, toComponent, newToMeta);
        if (!toNewComponent) {
            burn(toComponent);
        }
        burn(fromComponent);

        uint256 scratchCost = scratchUpgradeCosts[startingTraits];
        scratchContract.burn(msg.sender, scratchCost);
    }

    function mintFromMeta(address to, uint256 id, uint256 oldId, componentMetadata memory md) internal {
        _safeMint(to, id);
        emit newComponent({
            id: id,
            oldId: oldId,
            score: md.score,
            TRAIT_TYPE_1: md.TRAIT_TYPE_1,
            TRAIT_TYPE_2: md.TRAIT_TYPE_2,
            TRAIT_TYPE_3: md.TRAIT_TYPE_3,
            TRAIT_TYPE_4: md.TRAIT_TYPE_4,
            componentType: componentType
        });
        componentMeta[id] = md;
    }

    function burn(uint256 component) internal {
        _burn(component);
        delete componentMeta[component];
    }

    // uint256[4] order is TRAIT_TYPE_1, TRAIT_TYPE_2, wood trim, accessory
    // int is score
    // the bool is whether component is locked
    function getComponentMetadata(uint256 component) external view returns (uint256[4] memory, uint256, bool) {
        componentMetadata memory meta = componentMeta[component];
        uint256[4] memory traits = [meta.TRAIT_TYPE_1, meta.TRAIT_TYPE_2, meta.TRAIT_TYPE_3, meta.TRAIT_TYPE_4];
        return (traits, meta.score, ownerOf(component) == address(this));
    }

    // function getComponentTraits(uint256 component) external view returns (uint256[4] memory) {
    //     componentMetadata storage meta = componentMeta[component];
    //     uint256[4] memory traits = [meta.TRAIT_TYPE_1, meta.TRAIT_TYPE_2, meta.TRAIT_TYPE_3, meta.TRAIT_TYPE_4];
    //     return traits;
    // }

    function getScore(uint256 component) external view returns (uint256) {
        return componentMeta[component].score;
    }

    function getTraitType(uint256 trait) internal pure returns (uint256) {
        if (trait >= 101 && trait <= 108) {
            return TRAIT_TYPE_1;
        } else if (trait >= 201 && trait <= 208) {
            return TRAIT_TYPE_2;
        } else if (trait >= 301 && trait <= 308) {
            return TRAIT_TYPE_3;
        } else if (trait >= 401 && trait <= 408) {
            return TRAIT_TYPE_4;
        } else {
            revert("cannot get trait type on invalid trait");
        }
    }

    function pickRandomTrait(uint256 input) internal view returns (uint256, uint256) {
        uint256 traitSelection = util.random(msg.sender, input) % supplyOfAllTraits;
        uint256 last = 0;
        for (uint256 i = 0; i < traitsOrderedByInitialSupply.length; i++) {
            uint256 trait = traitsOrderedByInitialSupply[i];
            uint256 remainingSupply = traitToTraitMeta[trait].supply;
            if (traitSelection >= last && traitSelection < last + remainingSupply) {
                return (getTraitType(trait), trait);
            }
            last = last + remainingSupply;
        }
        revert("no traits left to mint");
    }


    /*
    ERC721 OVERRIDES
    */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view override returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender) || spender == boomRoomContract);
    }

    function _baseURI() internal view override returns (string memory) {
        return baseURI;
    }
}

File 8 of 22 : IBurnable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBurnable {
    function burn(address _from, uint256 _amount) external;
}

File 9 of 22 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 10 of 22 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 11 of 22 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

File 12 of 22 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 13 of 22 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 14 of 22 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 15 of 22 : ERC721Holder.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/utils/ERC721Holder.sol)

pragma solidity ^0.8.0;

import "../IERC721Receiver.sol";

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

File 16 of 22 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 17 of 22 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 18 of 22 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 19 of 22 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 20 of 22 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

File 21 of 22 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner nor approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 22 of 22 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "details": {
      "constantOptimizer": true,
      "cse": true,
      "deduplicate": true,
      "inliner": true,
      "jumpdestRemover": true,
      "orderLiterals": true,
      "peephole": true,
      "yul": false
    },
    "runs": 200
  },
  "evmVersion": "london",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : uri (string):

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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