Problem2

using System;
using System.Linq;

namespace Problem2
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] particles = Console.ReadLine()
                .Split("|", StringSplitOptions.RemoveEmptyEntries)
                .ToArray();

            while (true)
            {
                string line = Console.ReadLine();

                if (line == "Done")
                {
                    break;
                }

                string[] tokens = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);

                string command = tokens[0];
                string instruction = tokens[1];

                if (command == "Move")
                {
                    int index = int.Parse(tokens[2]);

                    if (IsValidIndex(particles, index))
                    {
                        if (instruction == "Left" && IsPossibleMoveLeft(particles, index))
                        {
                            string oldElement = particles[index];
                            particles[index] = particles[index - 1];
                            particles[index - 1] = oldElement;

                        }
                        else if (instruction == "Right" && IsPossibleMoveRight(particles, index))
                        {
                            string oldElement = particles[index];
                            particles[index] = particles[index + 1];
                            particles[index + 1] = oldElement;
                        }
                    }
                }
                else if (command == "Check")
                {
                    if (instruction == "Even")
                    {
                        for (int i = 0; i < particles.Length; i++)
                        {
                            if (i % 2 == 0)
                            {
                                Console.Write($"{particles[i]} ");
                            }
                        }
                        Console.WriteLine();
                    }
                    else if (instruction == "Odd")
                    {
                        for (int i = 0; i < particles.Length; i++)
                        {
                            if (i % 2 == 1)
                            {
                                Console.Write($"{particles[i]} ");
                            }
                        }
                        Console.WriteLine();
                    }
                }
            }
            string weapon = string.Concat(particles);
            Console.WriteLine($"You crafted {weapon}!");

            //string weapon = String.Empty;
            //foreach (string particle in particles)
            //{
            //    weapon += particle;
            //}
            //Console.WriteLine($"You crafted {weapon}!");
        }
        private static bool IsPossibleMoveRight(string[] parts, int index)
        {
            return index + 1 < parts.Length;
        }

        private static bool IsPossibleMoveLeft(string[] parts, int index)
        {
            return index - 1 >= 0;
        }

        private static bool IsValidIndex(string[] parts, int index)
        {
            return index >= 0 && index < parts.Length;
        }
    }
}