add packages, receiving & processing

lib/helpers/firebase_helper.dart

@@ -30,3 +30,20 @@ Future<String> uploadStorage(String path, File file, {String fileName}) async {
   print("meta:${await storageReference.getMetadata()}");
   return downloadUrl;
 }
+
+Future<void> deleteStorageFromUrls(List<String> urls) async {
+  if (urls == null) return;
+  for (int i = 0; i < urls.length; i++) {
+    await deleteStorageFromUrl(urls[i]);
+  }
+}
+
+Future<void> deleteStorageFromUrl(String url) async {
+  try {
+    StorageReference storageReference =
+        await FirebaseStorage.instance.getReferenceFromUrl(url);
+    await storageReference.delete();
+  } catch (e) {
+    log.warning("deleteStorage:$e");
+  }
+}