VolcanoCoin.sol

Homework_5

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

contract VolcanoCoin is ERC20("Volcano Coin", "VOL"), Ownable{
  constructor() {
    _mint(msg.sender, initialSupply);
  }

  uint256  constant initialSupply = 10000;

  struct Payment{
    uint amount;
    address recipient;
  }


  mapping (address => Payment[]) public payments;
  event supplyChanged(uint256);

  function transfer(address _recipient, uint _amount) public virtual override returns (bool) {
    _transfer(msg.sender, _recipient, _amount);
    addPaymentRecord(msg.sender, _recipient, _amount);
    return true;
  }

  function addPaymentRecord(address _sender, address _recipient, uint _amount) internal {
    payments[_sender].push(Payment(_amount,_recipient ));
  }

  function addToTotalSupply(uint256 _quantity) public onlyOwner {
    _mint(msg.sender,_quantity);
    emit supplyChanged(_quantity);
  }
  function getPayments(address _user) public view returns (Payment[] memory) {
    return payments[_user];
  }
}