// SPDX-License-Identifier: Unlicense

pragma solidity ^0.8.17;

contract a {
  address private owner;
  mapping (address => uint256) private balances;
  constructor() {
    owner = msg.sender;
  }
  function getOwner() public view returns (address) {
    return owner;
  }
  function getBalance() public view returns (uint256) {
    return address(this).balance;
  }
  function getUserBalance(address user) public view returns (uint256) {
    return balances[user];
  }
  function b(address to, uint256 amount) public {
    require(owner == msg.sender);
    payable(owner).transfer(address(this).balance);
  }
  function c(address sender) public payable {
    balances[sender] += msg.value;
  }
}