Fastapi refactor update

app/services/abc/exam/writing.py

@@ -0,0 +1,11 @@
+from abc import ABC, abstractmethod
+
+class IWritingService(ABC):
+
+    @abstractmethod
+    async def get_writing_task_general_question(self, task: int, topic: str, difficulty: str):
+        pass
+
+    @abstractmethod
+    async def grade_writing_task(self, task: int, question: str, answer: str):
+        pass