Update chain.py

chain.py

@@ -51,7 +51,7 @@ class CustomChain(Chain, BaseModel):
 
         source_string = "\n\n*Sources:* "
         for i, source in enumerate(set(source_list)):
-            source_string += f"<a href=\"https://{source}\" target=\"_blank\">[{i}]</a>""
+            source_string += f"<a href=\"https://{source}\" target=\"_blank\">[{i}]</a>"
 
         final_answer = answer + source_string
         return {"answer": final_answer}