practice tdd repeat

Author: Abayie

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

@@ -1,5 +1,13 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) {
+    throw new Error("Count must be non-negative");
+  }
+
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }
 
 module.exports = repeat;