//Deepdive-V3-377190-V2-Step 2-Code

using System;

using System.Text;

​

public class StringRepeaterSolution

{

    public static string StringRepeater(string originalString, int numberOfRepetitions)

    {

        if (string.IsNullOrEmpty(originalString) || numberOfRepetitions <= 0)

        {

            return string.Empty;

        }

​

        StringBuilder result = new StringBuilder(originalString.Length * numberOfRepetitions);

        for (int i = 0; i < numberOfRepetitions; i++)

        {

            result.Append(originalString);

        }

        return result.ToString();

    }

}

​

public class Program

{

    public static void Main(string[] args)

    {

        Console.WriteLine(StringRepeaterSolution.StringRepeater("ha", 3));   // Output: hahaha

        Console.WriteLine(StringRepeaterSolution.StringRepeater("echo", 1)); // Output: echo

        Console.WriteLine(StringRepeaterSolution.StringRepeater(" ", 5));    // Output:

        Console.WriteLine(StringRepeaterSolution.StringRepeater("test", 0));  // Output: ""

        Console.WriteLine(StringRepeaterSolution.StringRepeater("test", -2)); // Output: ""

        Console.WriteLine(StringRepeaterSolution.StringRepeater("", 5));   // Output: ""

        Console.WriteLine(StringRepeaterSolution.StringRepeater(null, 5));  // Output: ""

        Console.WriteLine(StringRepeaterSolution.StringRepeater("你好", 2)); // Output: 你好你好

    }

}