user_submissions_json = self.gcs_service.download_as_string(self.bucket_name, f"users/{encoded_student_id_url}/submissions.json")

submission_service.py

@@ -110,7 +110,8 @@ class SubmissionService:
 
     def get_student_submissions_list(self, student_id):
         try:
-            user_submissions_json = self.gcs_service.download_as_string(self.bucket_name, f"users/{student_id}/submissions.json")
+            encoded_student_id_url = urllib.parse.quote(student_id, safe='')
+            user_submissions_json = self.gcs_service.download_as_string(self.bucket_name, f"users/{encoded_student_id_url}/submissions.json")
             user_submissions = json.loads(user_submissions_json)
         except Exception as e:
             print(f"Error: {e}")