workflows(course_learn_suggest_expectations): Refactor to handle exisiting expectations in prompt

workflows/courses/suggest_expectations.py

@@ -56,10 +56,16 @@ class SuggestExpectations:
             Check Question: {expectation.check_question}
                                        """)
 
+        existing_expectations_str = ""
+        if len(existing_expectations) > 0:
+            existing_expectations_str = "Here are existing Learning Outcomes & Check Questions for the module, don't repeat these learning outcomes:\n ```"
+            existing_expectations_str += "\n".join(existing_expectations)
+            existing_expectations_str += "\n```"
+
         response = chain.invoke({
             "course": self.course, "module": self.module, "tasks": "* " + ("\n* ".join(self.tasks)),
             "format_instructions": parser.get_format_instructions(),
-            "existing_expectations": "\n".join(existing_expectations)
+            "existing_expectations": existing_expectations_str
         })
 
         return response