input: Write a function to scrape a given website and return the parsed content using BeautifulSoup. The function should accept a URL as input and return the parsed content.
  assert scrape_website("http://example.com")==<parsed content>
  assert scrape_website("https://www.github.com")==<parsed content>
  assert scrape_website("https://www.google.com")==<parsed content>
  assert scrape_website("")==None
  assert scrape_website("http://nonexistentwebsite.com")==None
output: import requests
  from bs4 import BeautifulSoup
  
  def scrape_website(url):
      try:
          response = requests.get(url)
          response.raise_for_status()
          return BeautifulSoup(response.text, 'html.parser')
      except (requests.RequestException, ValueError):
          return None