add message if buffer is null

雾聪

2023-08-24 0b692f69b5c8b6a43765cc6e98d3a259a1fc86f9

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version: '3.0'
services:
  web:
    image: python:3-alpine
    command: python3 -m http.server 8080
    volumes:
      - .:/num2words