using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public static class Extensions

{

    public static IEnumerable<T> FilterNulls<T>(this IEnumerable<T?> source)

        where T : struct

    {

        foreach (var element in source)

        {

            if (element.HasValue)

            {

                yield return element.Value;

            }

        }

    }

}