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contracts...property.sol

pragma solidity ^0.8.4;

contract PropertyTransferApp {
    
    address public contractOwner;
    constructor() public {
        contractOwner = msg.sender;
    }
    
    modifier onlyOwner(){
        require(msg.sender == contractOwner);
        _;
    }
    
    struct Property {
        uint256 id;
        string name;
        string owner;
        uint256 value;
        uint256 area;
        bool exists;

    }
    
    mapping(uint256 => Property) public properties;
    
    function addProperty(
        uint256 _propertyid,
        string memory _name,
        string memory _owner,
        uint256 _value,
        uint256 _area
    )public onlyOwner {
        require(_value > 0, "Property value must be greater than 0");
        properties[_propertyid].name = _name;
        properties[_propertyid].owner = _owner;
        properties[_propertyid].value = _value;
        properties[_propertyid].area = _area;
        properties[_propertyid].exists = true;

    }
    
    function queryProperty(uint256 _propertyid)
        public view returns(
            string memory name,
            string memory owner,
            uint256 area,
            uint256 value

            ){
            require(properties[_propertyid].exists, "Property must be present to query");
                return(
            properties[_propertyid].name,
            properties[_propertyid].owner,
            properties[_propertyid].area,
            properties[_propertyid].value

                    );
            }
            
    function transferPropertyOwnership(
        uint256 _propertyid, string memory _newOwner) public {
            require(properties[_propertyid].exists, "Property must be present before transfer");
            properties[_propertyid].owner = _newOwner;
        }
    
}