fix

Author: LiyemaMfengwana

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

@@ -1,4 +1,8 @@
 function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("Count cannot be negative");
+  }
+
   let result = "";
 
   for (let i = 0; i < count; i++) {