public static string RemoveLetterString(string str, string delimiter, int nChars)
{
// string stringValue = CleanUpProductName(str);
string stringValue = UserDefinedFunctions.RemoveDuplicateString(str);
List <string> stringsList = new List <string>(stringValue.Split(new string[] { delimiter }, StringSplitOptions.RemoveEmptyEntries));
StringBuilder res = new StringBuilder();
foreach (string item in stringsList)
{
res.Append(item + " ");
int i = 0;
while (i <= item.Length && (item.Substring(i, Math.Min(i + nChars, item.Length - i))).Length >= nChars)
{
res.Append(item.Remove(i, nChars) + " ");
i++;
}
}
// Result
return(res.ToString().Trim());
}