Update app.py

app.py

@@ -129,7 +129,7 @@ async def find_solutions(requirements: ReqGroupingResponse):
         try:
             # Remove code blocks if present
             cleaned = llm_response.strip()
-            if cleaned.startswith('```
+            if cleaned.startswith('```json'):
                 cleaned = cleaned[7:]
             if cleaned.startswith('```'):
                 cleaned = cleaned[3:]