codewars #47 String repeat (8kyu)

#47 String repeat 

Write a function called repeatStr which repeats the given string string exactly n times.

repeatStr(6, "I") // "IIIIII"

repeatStr(5, "Hello") // "HelloHelloHelloHelloHello"

import java.util.*;

public class Solution {
    public static String repeatStr(final int repeat, final String string) {
        if(repeat < 0) return "";
        return String.join("", Collections.nCopies(repeat,string));
    }
}