# KryptoCamp 第二周
基本題

引用 OpenZeppelin ERC20 部署一個自定義的 ERC20 Token 在 Goerli 鏈上

1. 開源合約並提交合約地址 **(2023/3/18還未實現)**
2. 實作 mint 和 burn 功能
3. 轉移 100 個 Token 到以下地址 0x6e24f0fF0337edf4af9c67bFf22C402302fc94D3
4. 轉移 Token 給所有組員

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.18 <0.9.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
// testGoaDuck tGD
contract testGaoDuckToken is ERC20{
    constructor (string memory name, string memory symbol) ERC20(name,symbol){
        
    }
    function mint(address account, uint256 amount) external {
        _mint(account,  amount * (10 ** decimals()));
    }

    function burn(address account, uint256 amount) external{
        _burn(account, amount * (10 ** decimals()));
    }
    
}

//0xae6B0f75b55fa4c90b2768e3157b7000241A41c5

引用 OpenZeppelin ERC721 部署一個 ERC721 NFT 合約，同時擁有付費 mint 功能

1. 開源合約並提交合約地址
2. 將檔案上傳至 ipfs
3. 擁有白名單機制並且將組員加入白名單 **(2023/3/18還未實現)**
4. 加入一種自定義功能，例如：荷蘭拍、盲盒、返佣、融合…**(2023/3/18還未實現)**
https://testnets.opensea.io/collection/txt-beomgyu-5

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.18 <0.9.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
//// testnet Fanart, BEOMGYU painted by @xizhiii 
contract FanartNFT is ERC721 {
    uint256 public totle_Supply = 0;
    address public  creater;
    address[] public owner;
    uint256 public max_Supply=5;
    uint256 public mintPrice = 0.01 ether;
    // using Strings for uint256;

    constructor(string memory _name, string memory _symbol) ERC721(_name, _symbol) {
        creater = msg.sender;
    }


    
    function mint() public payable {
        require(totle_Supply<max_Supply);
        require(msg.value >= mintPrice, "Insufficient payment.");
        _safeMint(msg.sender, totle_Supply);
        owner.push(msg.sender);
        totle_Supply++;
    }

    function _baseURI() internal pure override returns (string memory) {
        return "https://gateway.pinata.cloud/ipfs/QmZtd6uks6g92fhzoadBy8iVn3Lmdhg8AeycS1KUQXCsM4";
    }
    function tokenURI(uint256 _tokenId) public view override returns (string memory) {
    _requireMinted(_tokenId);

    string memory baseURI = _baseURI();
    string memory tokenIdStr = Strings.toString(_tokenId);
    return string(abi.encodePacked(baseURI, "/", tokenIdStr, "/", tokenIdStr, ".json"));
    }


    function ownerOf(uint256 _tokenId) public view override returns (address){
        if(_tokenId < max_Supply)
        {
            return owner[_tokenId];
        }
        else {
            return address(0);
        }
    }
    function withdraw() public {
        require(msg.sender == creater, "Only the contract creator can call this function");
        payable(msg.sender).transfer(address(this).balance);
    }

}

//TXT BEOMGYU
//TXT Bear
//0xf85Dd6Fc6ED85099408A411e300B321647E3Cc1c