PM IT PUMP task

Program.cs

using System;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

namespace PMITPUMP
{
    class Program
    {
        private static HttpClient httpClient {get;} = new HttpClient();
        private static async Task Main(string[] args)
        {
            var mess = await httpClient.GetStringAsync("https://gist.githubusercontent.com/skalinets/23691610f9bbf590b6fba51e373375b4/raw/0b9cc1e97650f5204edbd7b1906e03435506eaf7/mess.txt");


            var dic = mess.GroupBy(c=> c).ToDictionary(c=> c.Key, c=> c.Count());
            var secretWord = new string(mess.Where(c=> dic[c] < 10).ToArray());


            Console.WriteLine(secretWord);
            Console.ReadKey();
        }
        
    }
}