P05.SoftUni Parking (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 static class Program
    {
        public static void Main()
        {
           var parking = new Dictionary<string, string>();
           var n = int.Parse(Console.ReadLine());
           for(int i=0;i<n;i++)
           {
            var input = Console.ReadLine().Split();
            var command = input[0];

            if(command == "register")
            {
            var username = input[1];
            var licensePlateNumber= input[2];


            if(!parking.ContainsKey(username))
            {
                parking[username] = string.Empty;
            }
            if(parking[username] == string.Empty)
                {
                    parking[username] = licensePlateNumber;
                    Console.WriteLine($"{username} registered {licensePlateNumber} successfully");

                }
                else
                {
                    Console.WriteLine($"ERROR: already registered with plate number {licensePlateNumber}");
                }

            }

            else if(command=="unregister")
            {

            var username = input[1];
            if(!parking.ContainsKey(username))
            {
                Console.WriteLine($"ERROR: user {username} not found");

            }
            else
            {

                Console.WriteLine($"{username} unregistered successfully");
                parking.Remove(username);
            }


            }

           }

           foreach(var kvp in parking)
           {
            Console.WriteLine($"{kvp.Key} => {kvp.Value}");
           }
        }
    }
}