// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002092/string-toplural

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.IO;

​

public class Program

{

    public static string FileName = "test.txt";

    public static void Main()

    {   

        string [] input = {"Entity", "Student", "Course", "Class", "Language"};

        foreach(var str in input)

        {

            //C# Extension Method: String - ToPlural

            var output = str.ToPlural();

            Console.WriteLine(output);

        }

    }

}