notificationManagerを共有するように

app/src/main/java/com/example/childguard/TestService.java

@@ -197,8 +197,6 @@ public class TestService extends Service {
             notificationManager.createNotificationChannel(channel);
         }
 
-
-        NotificationManager notificationManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
         if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
             return;
         }