ReversedSubStringsEx24

        public static string ReverseSubString(string st)
        {
            string subSt;
            int i = 0, nextI;
            while (i < st.Length)
            {
                nextI = st.IndexOf('0', i);
                subSt = st.Substring(i, nextI - i);
                st = st.Replace(subSt, ReverseString(subSt));
                i = nextI + 1;
            }
            return st;
        }
        public static string ReverseString(string st)
        {
            string newSt = "";
            for (int i = st.Length - 1; i > -1; i--)
                newSt += st[i];
            return newSt;
        }