Write a C# Sharp program to find out the maximum element between the first or last element in a given array of integers ( length 4), replace all elements with maximum element

using System;
using System.Linq;
namespace exercises
{
   class Program
    {       
        static void Main(string[] args)
        {
            int[] item = test(new[] { 10, 20, -30, -40 }); 
           
           Console.Write("New array: ");
         
           foreach(var i in item)
            {
               Console.Write(i.ToString()+" ");
            }
        }
        
       public static int[]  test(int[] nums)
          {
             int max = nums.Max();

            return new int[] { max, max, max, max };
          } 
   }
}