Shopping list (C# Shell App Paste)

//Disclaimer: The creator of 'C# Shell (C# Offline Compiler)' is in no way responsible for the code posted by any user.
using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;

namespace CSharp_Shell
{

    public class P02_Shopping_List
    {
        public static void Main()
        {
            var list = Console.ReadLine()
            .Split(new []{"!", " "}, StringSplitOptions.RemoveEmptyEntries)
            .ToList();

            while(true)
            {
                var input = Console.ReadLine();

                if(input == "Go Shopping!")
                {
                    break;
                }

                var items = input.Split(" ");

                var command = items[0].ToLower();
                if(command == "urgent")
                {
                    var item = items[1];
                    var firstElement = list.First();

                    if(firstElement == string.Empty)
                    {
                        list.Insert(0, item);
                    }


                }

                if(command == "unnecessery")
                {
                    var item = items[1];
                    if(list.Contains(item))
                    {
                        list.Remove(item);
                    }
                }

                if(command == "correct")
                {
                    var oldItem = items[1];
                    var newItem = items[2];
                    if(list.Contains(oldItem))
                    {
                        var indexOld = list.IndexOf(oldItem);
                        list.RemoveAt(indexOld);
                        list.Insert(indexOld, newItem);
                    }
                }

                if(command == "rearrange")
                {
                    var item = items[1];

                    if(list.Contains(item));
                    {
                        list.Remove(item);
                        list.Add(item);
                    }
                }


            }

            for(int i = 0; i<list.Count-1;i++)
            {
                Console.Write($"{list[i]}, ");
            }
            Console.Write(list.LastOrDefault());



        }
    }
}