input: Write a python function to find the latest news article given a topic.
  assert get_latest_news("technology") == {'headline': 'Tech News Today', 'link': 'http://www.example.com/tech-news-today'}
  assert get_latest_news("sports") == {'headline': 'Sports Update', 'link': 'http://www.example.com/sports-update'}
  assert get_latest_news("politics") == {'headline': 'Political Headlines', 'link': 'http://www.example.com/political-headlines'}
output: def get_latest_news(topic):
      news_articles = {
          "technology": {'headline': 'Tech News Today', 'link': 'http://www.example.com/tech-news-today'},
          "sports": {'headline': 'Sports Update', 'link': 'http://www.example.com/sports-update'},
          "politics": {'headline': 'Political Headlines', 'link': 'http://www.example.com/political-headlines'}
      }
      return news_articles.get(topic, None)