revise final_answer

prompts.yaml

@@ -324,14 +324,11 @@
 #  "template": |-
 #   Here is the final answer to the task:
 #   {{final_answer}}
-#"final_answer":
-#  "pre_messages": "<<<"
-#  "post_messages": ">>>"
-
-prompt_templates:["final_answer"]={
-"pre_massage":[
-  {"role": "system", "content": "You are a helpful assistant. Return the final answer clearly."}
-],
-  "format": "{output}",
-  "post_messages": [<<<]
-}
+"final_answer":
+  "pre_messages":
+    role:
+      system
+    content:
+      You are a helpful assistant. Return the final answer clearly
+  "post_messages": 
+    ">>>"