Convert String to Pig Latin, C#

Convert String to Pig Latin

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string str = "test test test hello world pig latin";
            Console.WriteLine(MakePigLatin(str));
        }
        
        public static string MakePigLatin(string str)
        {
            string[] words = str.Split(' ');
            str = String.Empty;
            for (int i = 0; i < words.Length; i++)
            {
                if (words[i].Length <= 1) continue;
                string output = new String(words[i].ToCharArray());
                output = output.Substring(1, output.Length -1) + output.Substring(0, 1) + "ay ";
                str += output; 
            }
            return str.Trim();
        }
    }
}


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