refined code of output

agent.py

@@ -231,8 +231,11 @@ class BasicAgent:
         ):
             answer = answer[1:-1].strip()
 
-        stuff_to_remove = ["Stdout: Output: "]
+        stuff_to_remove = "Stdout:"
         if answer.startswith(stuff_to_remove):
             answer = answer[len(stuff_to_remove) :].strip()
 
+        stuff_to_remove_bis = "Output: "
+        if answer.startswith(stuff_to_remove_bis):
+            answer = answer[len(stuff_to_remove_bis) :].strip()
         return answer