public ActionResult RomanNumeralInput(RomanNumeralModel request)
        {
            if (ModelState.IsValid)
            {
                var romanConverter = new RomanNumeralConverter();
                var romanData      = new RomanNumeralRequest();
                romanData.UserNumber = request.UserNumber;

                var result = romanConverter.ConvertNumber(romanData);
                return(View("RomanNumeralOutput", result));
            }
            else
            {
                return(View(request));
            }
        }
        public ActionResult RomanNumeralInput()
        {
            var model = new RomanNumeralModel();

            return(View(model));
        }