public string ConvertToRomanNumber(int number)
 {
     if (romanNumbers.HasNumber(number))
     {
         return(romanNumbers.GetRomanNumber(number));
     }
     if (RomanNumbersExtraCases.HasNumber(number))
     {
         return(RomanNumbersExtraCases.GetRomanNumber(number));
     }
     return(CalcOtherNumbers(number));
 }