Write a C# Sharp program to get the file name (including extension) from a given path

using System;
using System.Linq;
namespace exercises
{
    class Program
    {
        static void Main(string[] args)
        {
            string file_path;
            file_path = "c:/csharp/ex/test.cpp";
            Console.WriteLine(test(file_path));                     
            file_path = "c:/movies/abc.mp4";
            Console.WriteLine(test(file_path));
            file_path = "test.txt";
            Console.WriteLine(test(file_path));            
        }
        public static string test(string file_path)
        {
            return file_path.Split('/').Last();
        }
    }
}