refactor: use negative slice for minutes as suggested by reviewer

Author: MouawiaElkhalifa

Sprint-2/5-stretch-extend/format-time.js

@@ -4,7 +4,12 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  const minutes = time.slice(3, 5);
+  const minutes = time.slice(-2);
+
+  // Basic validation (fix bug: invalid hour values)
+  if (hours < 0 || hours > 23) {
+    return "Invalid time";
+  }
 
   // If midnight (00), convert to 12 am
   if (hours === 0) {
@@ -37,4 +42,4 @@ const targetOutput2 = "11:00 pm";
 console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
-);
+);