input: Write a function to scrape the headlines from an online news website using BeautifulSoup and requests library. The function should take the URL of the news website as an input, retrieve the HTML content, parse it to find and print the headlines.
  assert scrape_headlines("https://www.example-news-site.com/")==None
  assert scrape_headlines("https://www.another-example-news-site.com/")==None
output: def scrape_headlines(url):
      import requests
      from bs4 import BeautifulSoup
      response = requests.get(url)
      soup = BeautifulSoup(response.text, 'html.parser')
      headlines = soup.find_all('h1')
      for headline in headlines:
          print(headline.text)