public string SpellNumber(long number)
{
var digits = number.ToString().Select(digit => int.Parse(digit.ToString())).Reverse().ToArray();
var numberNames = new List <string>();
// Calculate the triplets
var tripletCount = (int)Math.Ceiling(digits.Length / 3.0);
for (var tripletNumber = 0; tripletNumber < tripletCount; tripletNumber++)
{
var triplet = Triplet.ToText(digits, tripletNumber);
if (string.IsNullOrEmpty(triplet))
{
continue;
}
if (tripletCount > 0 && tripletNumber > 0)
{
numberNames.Add(NumberMaps.Triplets[tripletNumber]);
}
numberNames.Add(triplet);
}
// Join all triplets
var result = string.Join(" ", numberNames.AsEnumerable().Reverse());
return(result);
}