add dispose to files to remove controllers when not used

Frontend/patient_manager/lib/components/prescipInput.dart

@@ -546,6 +546,12 @@ class _PrescripInputState extends State<PrescripInput> {
     );
   }
 
+  @override
+  void dispose() {
+    _focusNode.dispose();
+    super.dispose();
+  }
+
   @override
   void initState() {
     //futueMeds = getMedList(endpointMeds);