different submit function

app.py

@@ -29,7 +29,7 @@ def make_submission(
     timestamp = datetime.utcnow().isoformat()
 
     with (path_obj.open("rb") as f_in):
-        file_content = f_in.read()
+        file_content = f_in.read().decode("utf-8")
 
         # write to dataset
         filename = f"{user_state}/{timestamp.replace(':', '-')}_{user_state}.json"