TheImitationGame-ExamPreparation

using System;

namespace TheImitationGame
{
    class Program
    {
        static void Main(string[] args)
        {
            string encryptedMessage = Console.ReadLine();
            string command = string.Empty;
            while ((command = Console.ReadLine()) != "Decode")
            {
                string[] commandArray = command.Split('|');
                if (commandArray[0] == "Move")
                {
                    int n = int.Parse(commandArray[1]);
                    string firstNLetters = encryptedMessage.Substring(0, n);
                    int lastLettersLength = encryptedMessage.Length - n;
                    string lastLetters = encryptedMessage.Substring(n, lastLettersLength);
                    string newString = lastLetters + firstNLetters;
                    encryptedMessage = newString;
                }

                else if (commandArray[0] == "Insert")
                {
                    int index = int.Parse(commandArray[1]);
                    string value = commandArray[2];
                    encryptedMessage = encryptedMessage.Insert(index, value);
                }

                else if (commandArray[0] == "ChangeAll")
                {
                    string substring = commandArray[1];
                    string replacement = commandArray[2];

                    while (encryptedMessage.Contains(substring))
                    {
                        encryptedMessage = encryptedMessage.Replace(substring, replacement);
                    }
                }
            }

            Console.WriteLine($"The decrypted message is: {encryptedMessage}");
        }
    }
}