Real Estate Solidity Contract

realEstate.sol

pragma solidity ^0.5.1;

contract RealEstate {
    address payable public seller;
    address public buyer;
    string public streetAddress;
    string title;
    uint256 public price;
    
    constructor () public {
        // Who is the seller
        seller = msg.sender;
        // What is the street address
        streetAddress = "3517, Gouripur Bazar, Gouripur, Cumilla, BD";
        // What is the title
        title = "4A24DB5D05488D99B92BD503F688DF980B49067476FADBBD04228C6145120A9F";
        // What is the price
        price = 99000000000000000000; // 99 ETH 
    }
    
    function buyHouse () payable public {
        require(seller != address(0x0));
        require(buyer == address(0x0));
        require(msg.sender != seller);
        require(msg.value == price);
        buyer = msg.sender;
        seller.transfer(msg.value);
    }
}