using System;

​

public class Program

{

    static int ? [] array = new int ? []{4, 3, 1, 2, 100, 8, 7, 73, 64, 10};

    public static void Main(string[] args)

    {

        Delete(3);

        foreach(var item in array)

        {

            Console.WriteLine(item);

        }

    }

​

    public static void Delete(int index)

    {

        if (index >= array.Length)

        {

            return;

        }

​

        if (index == array.Length - 1)

        {

            array[index] = null;

        }

​

        for (int i = index; i < array.Length - 1; i++)

        {

            array[i] = array[i + 1];

        }

​

        array[array.Length - 1] = null;

    }

}