public UserController registerNormalUser(string email, string userName, string password, [FromBody] string value)
        {
            UserController user = userFinder.findUser(email);

            if (user != null)
            {
                return(null);
            }

            NormalUserController normalUser = new NormalUserController(email, userName, password);

            normalUserRepo.addUser(normalUser.getNormalUser());
            return(normalUser);
        }
        public User login(string email, string password)
        {
            UserController user = userFinder.findUser(email);

            if (user == null || !user.getPassword().Equals(password))
            {
                return(null);
            }

            Global.setSession(user);

            return(user.getModel());
        }