Strings - Melrah SHake

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Numerics;

namespace C_
{


    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine();
            string pattern = Console.ReadLine();
            int patternCount = pattern.Length;
            while (true)
            {
                int start = input.IndexOf(pattern);
                int end = input.LastIndexOf(pattern);

                if (start >=0 && end >= 0 && input.Length > pattern.Length)
                {
                    string current = null;
                    var arr = input.ToCharArray();

                    for (int i = 0; i < arr.Length; i++)
                    {
                        if (i != start && i != end)
                        {
                            current += input[i];
                        }
                        else
                        {
                            i += pattern.Length-1;
                        }
                    }

                    input = current;

                    Console.WriteLine("Shaked it.");

                    int patternToRemove = pattern.Length / 2;

                    if (patternToRemove <= pattern.Length-1)
                    {
                        pattern.ToCharArray();
                        string newPatt = null;

                        for (int i = 0; i < pattern.Length; i++)
                        {
                            if (i == patternToRemove)
                            {
                                continue;
                            }
                            else
                            {
                                newPatt += pattern[i];
                            }
                        }

                        pattern = newPatt;
                        if (pattern==null)
                        {
                            Console.WriteLine("No shake.");
                            break;
                        }

                    }


                }
                else
                {
                    Console.WriteLine("No shake.");
                    break;
                }

            }

            Console.WriteLine(input);

        }
    }
}