fix abc func name

src/FinancialAgentApp.py

@@ -57,7 +57,7 @@ class FinancialAgentApp (ABC):
 
         # Step 2: Check if context is needed
         if response_state.isNeedContext:
-            context_prompt = self.handle_context(response_state)
+            context_prompt = self.__handle_context__(response_state)
             self.generate_final_answer(context_prompt)
         else:
             self.display_final_answer(response_state.response)
@@ -69,7 +69,7 @@ class FinancialAgentApp (ABC):
         return buf
     
     @abstractmethod
-    def handle_context(self, response_state: ResponseState) -> str:
+    def __handle_context__(self, response_state: ResponseState) -> str:
         """Handle context if need to add context from data/pdf"""
         pass