int main(){

    string input = "";
    string password;
    string userClearance;
    string directory;

    remenu:

    getline(cin, input);

    if(input.compare("FileSystem -i") == 0){
        cout << "Username: ";
        cin >> input;
        userRegistration(input);
        goto remenu;
    }
    else if(input.compare("FileSystem") == 0){
        fileInitializer();
        reLogin:
        cout << "Username: ";
        cin >> input;
        cout << "Password:";
        char ch = _getch();
        while(ch != 13){//character 13 is enter
          password.push_back(ch);
          ch = _getch();
        }
        cout << endl;

        if(userAuthentication(input, password, directory, userClearance)){
            displayMenu(stoi(userClearance));
        }
        else{
            cout << "Invalid username or password" << endl;
            reCaptcha:
            //captcha generation
            string captcha = generateCaptcha(9);
            cout << captcha;

            // Ask user to enter a CAPTCHA
            string usr_captcha;
            cout << "\nEnter above CAPTCHA: ";
            cin >> usr_captcha;

            // Notify user about matching status
            if (checkCaptcha(captcha, usr_captcha)){
                cout << "\nCAPTCHA Matched" << endl;
                goto reLogin;
            }
            else{
                cout << "\nCAPTCHA Not Matched" << endl;
                goto reCaptcha;
            }
        }
        cin.clear();
        cin.ignore(1000, '\n');
        goto remenu;
    }
    else{
        cout << "Unknown command entered, please try again" << endl;
        goto remenu;
    }
    return 0;
}