clean up

lib/data/services/messaging_imp.dart

@@ -0,0 +1,28 @@
+import 'package:fcs/data/provider/messaging_fcm.dart';
+
+import 'messaging_service.dart';
+
+class MessagingServiceImp implements MessagingService {
+  MessagingServiceImp();
+
+  static MessagingFCM messagingFCM;
+
+  @override
+  void init(onMessage,
+      {OnNotify onLaunch, OnNotify onResume, OnSetupComplete onSetupComplete}) {
+    messagingFCM = MessagingFCM(onMessage,
+        onLaunch: onLaunch,
+        onResume: onResume,
+        onSetupComplete: onSetupComplete);
+  }
+
+  @override
+  Future<void> subscribe(String topic) {
+    return messagingFCM.unsubscribeToTopic(topic);
+  }
+
+  @override
+  Future<void> unsubscribe(String topic) {
+    return messagingFCM.unsubscribeToTopic(topic);
+  }
+}