C#: Create a new string without the first and last character of a given string of any length

using System; // Import the System namespace which contains fundamental types and base classes

namespace exercises // Define a namespace called 'exercises'
{
    class Program // Define a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {
            // Output the result of the test function with different strings as arguments
            Console.WriteLine(test("Hello")); // Test with the string "Hello"
            Console.WriteLine(test("JS"));    // Test with the string "JS"
            Console.WriteLine(test(""));      // Test with an empty string
            Console.ReadLine(); // Wait for user input before closing the console window
        }

        // Function definition of test function that takes a string 's1' and returns a string
        public static string test(string s1)
        {
            // Check if the length of 's1' is less than 2
            // If true, return an empty string
            // Otherwise, return a substring starting from the second character
            // and ending at the second-to-last character of 's1'
            return s1.Length < 2 ? String.Empty : s1.Substring(1, s1.Length - 2);
        }
    }
}