Help with Triple String

public String tripleString(String str)
{
    String answer = "";  // This is the empty string we will build into our answer.
    for(int i = 0; i < 3; i++)
    {
		// You don't need to print the answer 3 times we need
		// return the string repeated 3 times.
        // We can use += to glue a string on to the end of another.
		// answer += "Hello!" will add "Hello!" to the end of answer.


    }
    return answer;
}