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contracts...PriceConverter.sol

// SPDX-License-Identifer: MIT

pragma solidity ^0.8.3;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";



library PriceConverter{

    // contract address ETH/USD price feed on rinkeby testnet
    //0x8A753747A1Fa494EC906cE90E9f37563A8AF630e
    //https://docs.chain.link/docs/ethereum-addresses/

    function getVersion() public view returns(uint256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
        return priceFeed.version();
    }

    function getPrice() public view returns(uint256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
        (,int256 answer,,,)=priceFeed.latestRoundData();

        return uint256(answer);
    }

    function convert(uint256 fundedAmount) internal view returns(uint256){
        //funded amount as WEI (1e18)
        uint256 ethPrice=getPrice();
        uint256 inUSD=(ethPrice/1e8*fundedAmount)/1e18;
        // divide by 1e8 (GWEI->ETH) and the total divide by 1e18(WEI->ETH) to get price in USD
        return inUSD;
    }
}