Update util.py

util.py

@@ -12,7 +12,7 @@ def get_questions(file_path):
 
     return result
 
-get_img_b64(file_path):
+def get_img_b64(file_path):
     with open(file_path, "rb") as file:
         return base64.b64encode(file.read()).decode("utf-8")