C# Fundamentals - 02. ShoppingList - 29.02.2020 G2

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

namespace _02._ShoppingList
{
    class ShoppingList
    {
        static void Main()
        {

            List<string> groceriesList = Console.ReadLine().Split('!').ToList();

            string command = Console.ReadLine();
            while (command != "Go Shopping!")
            {
                string[] currentCommand = command.Split();
                string instruction = currentCommand[0];

                if (instruction == "Urgent")
                {
                    string item = currentCommand[1];

                    if (!groceriesList.Contains(item))
                    {
                        groceriesList.Insert(0, item);
                    }
                }

                else if (instruction == "Unnecessary")
                {
                    string item = currentCommand[1];

                    if (groceriesList.Contains(item))
                    {
                        groceriesList.Remove(item);
                    }
                }

                else if (instruction == "Correct")
                {
                    string oldItem = currentCommand[1];
                    string newItem = currentCommand[2];

                    if (groceriesList.Contains(oldItem))
                    {
                        int index = groceriesList.IndexOf(oldItem);

                        groceriesList.Insert(index, newItem);
                        groceriesList.RemoveAt(index + 1);
                    }
                }

                else if (instruction == "Rearrange")
                {
                    string item = currentCommand[1];

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

                command = Console.ReadLine();
            }

            Console.WriteLine(string.Join(", ", groceriesList));
        }
    }
}