test_url_2_fixed

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

namespace test_url_2
{
    class Program
    {
        static void Main(string[] args)
        {
            //Test url:
            //https://www.pornhub.com/view_video.php?viewkey=608247796

            string input = Console.ReadLine();

            List<string> data = new List<string>();

            string[] prefix = new string[]
            {
                "URL:","Host:","Resource:"
            };

            while (input != "end")
            {
                string[] tokens = input.Split(new string[] { ":", "www.", "/" },
                    StringSplitOptions.RemoveEmptyEntries);

                string protocol = tokens[0];
                string host = tokens[1];
                string presource = input
                    .Substring(input.IndexOf("/") + host.Length - 1, input.Length - (protocol.Length + host.Length));

                string resource = string.Join(string.Empty, presource.Skip(3));

                data.Add(protocol);
                data.Add(host);
                data.Add(resource);

                input = Console.ReadLine();
            }
            IEnumerable entryRecords = prefix.Zip(data, (entry, record) => entry + " " + record);

            foreach (IEnumerable result in entryRecords)
            {
                Console.WriteLine(result);
            }
        }
    }
}