OPENAI_API_KEY rename, and automatic

app.py

@@ -10,7 +10,7 @@ MODEL = 'gpt-4-turbo'
 PRICE_PER_M = 10.00
 LIMIT = 125000 # some space for answer
 
-api_key = os_getenv("OPENAI_APIKEY")
+api_key = os_getenv("OPENAI_API_KEY")
 client = OpenAI(api_key=api_key)
 
 def new_state():
@@ -131,9 +131,7 @@ with gr.Blocks(title="Book summarization and more") as demo:
     files.upload(files_ready, [files, state], [letters, tokens, cost, state])
     files.change(files_changed, [files, state], [letters, tokens, cost, state])
 
-
 auth=os_getenv("APP_USERS", "null")
 auth=json_loads(auth)
 
 demo.launch(auth=auth)
-