public void Execute(List <string> parameter)
        {
            RegistrationResult registrationResult = _userFileManager.Register(parameter[0], parameter[1], parameter[2]);

            switch (registrationResult)
            {
            case RegistrationResult.InvalidUsername:
                Console.WriteLine("Username already exists");
                break;

            case RegistrationResult.NotMatchingPassword:
                Console.WriteLine("Passwords dont match");
                break;

            case RegistrationResult.Success:
                Console.WriteLine("Done");
                break;
            }
        }