fix

quiz/quiz_parser.py

@@ -59,6 +59,8 @@ with open(f"{filename}.txt", "r") as file:
             })
         else:
             raise Exception(f"Invalid line: {line}")
+    if current_problem is not None:
+        quiz["problems"].append(current_problem)
     
 if quiz is not None:
     with open(f"{filename}.json", "w") as file: