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contracts...RegisterDomainName.sol

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

contract RegisterDomainName{

struct DomainName {
    address itemAddress;
    uint itemDate;
    uint itemPrice;
}

mapping(string => DomainName) public registeredDomains;

function buyDomainName(string memory _domainName) public  payable {
    DomainName memory item = DomainName({
        itemAddress: msg.sender, 
        itemDate: block.timestamp,
        itemPrice: msg.value
        });

    registeredDomains[_domainName] = item;
}

function getAddressByDomainName(string memory _domainName) public view returns(address)  {
    return registeredDomains[_domainName].itemAddress;
}


function withdrawMoney() public {
  address payable receiver = payable(msg.sender);
  uint balance = address(this).balance;
  receiver.transfer(balance);
}

}