public bool Execute(string input)
{
if (input.Length < 3)
{
return(true);
}
for (int i = input.Length - 1; i >= 2; i--)
{
if (Roman.IsSmaller(input[i - 1].ToString(), input[i].ToString()) &&
Roman.IsSmaller(input[i - 2].ToString(), input[i].ToString()))
{
Console.WriteLine("SingleSubtraction Rule has been violated");
return(false);
}
}
return(true);
}