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contracts...FundMe.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17; // Hi I'am new to Solidity
import "./PriceConverter.sol";

contract FundMe{
    using PriceConverter for uint256;
    uint256 public minimumUsd = 10 * 1e18;
    address[] public funders;
    mapping(address => uint256) public addressesToAmountFunded;
    address public owner;

    constructor(){
        owner = msg.sender;
    }

    function fund() public payable {
        require( msg.value.getConversionRate() > minimumUsd, "didn't send enough");
        funders.push(msg.sender);
        addressesToAmountFunded[msg.sender] = msg.value;
    }

    function withdraw() public onlyOwner{
        for (uint256 i=0; i < funders.length; i++) {
            address funder = funders[i];
            addressesToAmountFunded[funder] = 0;
        }
        // reset array
        funders= new address[](0);
        // withdraw the funds
        // 1. transfer, on error reverts 
        //payable(msg.sender).transfer(address(this).balance);
        // 2. send if error should be thrown use require
        //bool sendSuccess = payable(msg.sender).send(address(this).balance);
        //require(sendSuccess,"Send failed");
        // 3. call, can add data, set gas, ...
        (bool callSuccess,) = payable(msg.sender).call{value: address(this).balance}("");
        require(callSuccess, "Call failed");
    }

    modifier onlyOwner{
        require(msg.sender == owner, "Sender is not the contract owner");
        _; // require() first then run all code of original funciton
    }
}

contracts...PriceConverter.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17; // Hi I'am new to Solidity
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

library PriceConverter {

    function getPrice() internal view returns (uint256) {
        // Goerli ETH / USD Address
        // https://docs.chain.link/docs/ethereum-addresses/
        AggregatorV3Interface priceFeed = AggregatorV3Interface(
            0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e
        );
        (, int256 answer, , , ) = priceFeed.latestRoundData();
        // ETH/USD rate in 18 digit
        return uint256(answer * 10000000000);
    }

    // 1000000000
    function getConversionRate(uint256 ethAmount)
        internal
        view
        returns (uint256)
    {
        uint256 ethPrice = getPrice();
        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
        // the actual ETH/USD conversion rate, after adjusting the extra 0s.
        return ethAmountInUsd;
    }

    function getVersion() internal view returns(uint256) {
        // ETHUSD Price Feed Address = 0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e

        AggregatorV3Interface priceFeed = AggregatorV3Interface(
            0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e
        );
        return priceFeed.version();
    }
}