Refactor repeatStr function by cleaning up code

Removed unnecessary checks for zero and commented-out test cases.

Author: vmoratti

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

@@ -3,8 +3,6 @@ function repeatStr(str, num) {
   var i;
   if (num < 0) {
     throw new Error("negative numbers are not valid");
-  } else if (num === 0) {
-    result = "";
   } else {
     for (i = 0; i < num; i++) {
       result += str;
@@ -13,8 +11,4 @@ function repeatStr(str, num) {
   return result;
 }
 
-//console.log(repeatStr("hello", -1));
-//console.log(repeatStr("hello", 0));
-//console.log(repeatStr("hello", 5))
-
-module.exports = repeatStr;
+module.exports = repeatStr;