HappyBirthday

        public static string Smarty(string st)
        {
            string word, lastWord = "";
            int i, nextI;
            i = 0;
            while (i < st.Length)
            {
                nextI = st.IndexOf(' ', i);
                if (nextI < 0)
                    nextI = st.Length;
                word = st.Substring(i, nextI - i);
                if (word.Equals(lastWord))
                    st = st.Remove(i - 1, nextI - i + 1);
                else
                    i = nextI + 1;
                lastWord = word;
            }
            return st;
        }