Update rag_langgraph.py

rag_langgraph.py

@@ -133,13 +133,13 @@ def run_multi_agent(prompt):
     for s in graph.stream(
         {
             "messages": [
-                HumanMessage(content=prompt)
+                HumanMessage(content="Code hello world and print it to the terminal")
             ]
         }
     ):
         if "__end__" not in s:
             print(s)
-            result += s
+            result = str(s)
             print("----")
         
     return result