Coinbrawl, Long to String conversion. Display gold with names.

Input: string
Output: string

    public static String GoldConverter(string gold)
        {
            var output = "";

            var lengte = gold.Length;

            if (lengte < 6)
                output = gold;

            if (lengte > 6 && lengte <= 9)
                output = (gold.Substring(0, gold.Length - 6) + "," + (gold.Substring(1, gold.Length - 5) + " Million"));

            if (lengte > 9 && lengte <= 12)
                output = (gold.Substring(0, gold.Length - 9) + "," + (gold.Substring(1, gold.Length - 8) + " Billion"));

            if (lengte > 12 && lengte <= 15)
                output = (gold.Substring(0, gold.Length - 12) + "," + (gold.Substring(1, gold.Length - 11) + " Trillion"));

            if (lengte > 15 && lengte <= 18)
                output = (gold.Substring(0, gold.Length - 15) + "," + (gold.Substring(1, gold.Length - 14) + " Quadrillion"));

            if (lengte > 18 && lengte <= 21)
                output = (gold.Substring(0, gold.Length - 18) + "," + (gold.Substring(1, gold.Length - 17) + " Quintillion"));

            return output;
        }