public static int DescendingOrder(int inputNumber)
{
int output;
// it was not explained in the task how to handle negative values so only choice I had was to throw an exception
if (inputNumber < MinimalAllowedNumber)
{
throw new Exception($"Input number must be higher than or equal to { MinimalAllowedNumber }.");
}
var inputNumberAsCharArray = ConvertionHelper.IntToCharArray(inputNumber);
SortingHelper.SortCharArrayDescending(inputNumberAsCharArray);
output = ConvertionHelper.CharArrayToInt(inputNumberAsCharArray);
return(output);
}