11.TextProcessingExercise-Replace Repeating Chars

11.Replace Repeating Chars
Write a program that reads a string from the console and replaces any sequence of the same letters with a single corresponding letter.
Examples
Input                                  Output
aaaaabbbbbcdddeeeedssaa                abcdedsa
qqqwerqwecccwd                         qwerqwecwd

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
         var repeatingChars = Console.ReadLine().ToCharArray();//Може и .ToList();
            var replacedChars = new List<char>();
            for (int i = 0; i < repeatingChars.Length; i++)    //Тогава "Length" става "Count - 1"!
            {
                if (!replacedChars.Contains(repeatingChars[i]))
                {
                    replacedChars.Add(repeatingChars[i]);
                }
                else if (repeatingChars[i - 1] != repeatingChars[i])
                {
                    replacedChars.Add(repeatingChars[i]);
                }
                //var currentChar = repeatingChars[i];
                //var nextChar = repeatingChars[i+1];
                //if (currentChar == nextChar)
                //{
                //    repeatingChars.Remove(repeatingChars[i]);    // Може и RemoveAt(i);
                //    i--;
                //}
            }
            Console.WriteLine(string.Join("",replacedChars));       //Тук ще е "repeatingChars"
    }
}