private static string TailClean(string s)
{
int b, e;
for (b = 0; b < s.Length && !NonStrippingChar(s[b]); b++) { }
for (e = s.Length - 1; e >= 0 && !NonStrippingChar(s[e]); e--) { }
return s.Substring(b, e - b + 1);
}