fix list and improve cloud functions

functions/helpers/firebase.js

@@ -0,0 +1,14 @@
+const admin = require("firebase-admin");
+
+async function deleteFolder(path) {
+  try {
+    console.log(`Deleting folder: ${path}`);
+    const bucket = admin.storage().bucket();
+    await bucket.deleteFiles({ prefix: path, force: true });
+    console.log(`Folder ${path} deleted successfully`);
+  } catch (e) {
+    console.log(e);
+  }
+}
+
+exports.deleteFolder = deleteFolder;