Fixing generate and random problem API

app.py

@@ -105,7 +105,7 @@ Here's the complete Python function implementation:
     
     generated_text = ""
     for chunk in llm(full_prompt, stream=True, **generation_kwargs):
-        generated_text += chunk["choices"]["text"]
+        generated_text += chunk["choices"][0]["text"]
     
     formatted_code = extract_and_format_code(generated_text)
     return {"solution": formatted_code}