Message.sol

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


contract AdviceContract {
    address owner;
    mapping(address => bool) public Doctors;

    struct Message {
        uint256 time;
        address doctor;
        string message;
    }
    mapping(address => Message[]) Patients;

    constructor() {
        owner = msg.sender;
    }

    function addDoctor(address _address) public {
        require(msg.sender == owner, "Unauthorized");
        Doctors[_address] = true;
    }

    function removeDoctor(address _address) public {
        require(msg.sender == owner, "Unauthorized");
        delete Doctors[_address];
    }
    function getOwner() public view returns ( address) {
        return owner;
    }

    function createPatient(address _address) public {
        require(msg.sender == owner, "UnAuthorized");
        Patients[_address].push(Message(block.timestamp, owner, "Created"));
    }

    function sendMessage(address _address, string memory _message) public {
        // require(Doctors[msg.sender], "UnAuthorized");
        Patients[_address].push(Message(block.timestamp, msg.sender, _message));
    }

    function getAllMessages() public view returns (Message[] memory) {
        return Patients[msg.sender];
    }

    function getLastMessage() public view returns (string memory) {
        return Patients[msg.sender][0].message;
    }
}