.Net Method Extensions

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;

public static class StringExtension
{
  public static string Capitalize(this string str) {
    return char.ToUpper(str[0]) + str.Substring(1);
  }

  public static string Decorate(this string str, string decoration) => $"{decoration} {str} {decoration}";

}

public class Program
{
  public static void Main()
  {    
    Console.WriteLine("java".Capitalize());
     Console.WriteLine("Java + C#".Decorate("🧡"));
  }

}