I implemented repeatStr function.

Author: Mona-Eltantawy

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,6 +1,6 @@
-function repeatStr() {
-  
-  return "hellohellohello";
+function repeatStr(str) {
+
+  return str.repeat(3);
 }
 
 module.exports = repeatStr;