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pragma solidity ^0.6.0;
import "@openzeppelin/contracts/utils/Address.sol";
interface IFlashLoanEtherReceiver {
function execute() external payable;
contract SideEntranceLenderPool {
using Address for address payable;
mapping (address => uint256) private balances;
function deposit() external payable {
balances[msg.sender] += msg.value;
function withdraw() external {
uint256 amountToWithdraw = balances[msg.sender];
balances[msg.sender] = 0;
function flashLoan(uint256 amount) external {
uint256 balanceBefore = address(this).balance;
require(balanceBefore >= amount, "Not enough ETH in balance");
IFlashLoanEtherReceiver(msg.sender).execute{value: amount}();
require(address(this).balance >= balanceBefore, "Flash loan hasn't been paid back");
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