Refactor repeatStr to use parameters and add error handling

Refactor repeatStr function to accept parameters for string and count, and add error handling for invalid count.

Author: khaliun-dev

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

@@ -1,5 +1,8 @@
-function repeatStr() {
-  return "hellohellohello";
+//function repeatStr() {
+//  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count >= 0) return str.repeat(count);
+  else throw new Error("Invalid format: count cannot be");
 }
 
 module.exports = repeatStr;