Smarty

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Smarty
{
    class Program
    {
        public static string MinimizeString(string sentence)
        {
            string newSentence, lastWord, word;
            newSentence = lastWord = word = "";
            for (int i = 0; i < sentence.Length; i++)
            {
                if (sentence[i] != ' ')
                    word += sentence[i];
                if (sentence[i] == ' ' || i + 1 == sentence.Length)
                {
                    if (lastWord != word)
                        newSentence += word +" ";
                    lastWord = word;
                    word = "";
                }
            }
            return newSentence;
        }
        static void Main(string[] args)
        {
            string sent;
            Console.WriteLine("Sentence: ");
            sent = Console.ReadLine();
            Console.WriteLine(MinimizeString(sent));
        }
    }
}