Updated the system prompt

app.py

@@ -87,8 +87,8 @@ def generate_flowchart(src_code: str) -> str:
     </thinking>
     graph TD
         A[Start: check_status] --> B{val > 10}
-        B -- True --> C[Return "Active"]
-        B -- False --> D[Return "Inactive"]
+        B -- True --> C[Return 'Active']
+        B -- False --> D[Return 'Inactive']
     """).strip()
 
     # Casting else PyLance gets mad