input: 
  def crawl(url):
      """This function takes a URL as input and starts a web crawler that visits the given URL,
      scrapes its content, and then looks for other links within the page to continue the crawling process.
      It uses a breadth-first search (BFS) approach to explore all the linked pages.
      
      >>> crawl("http://example.com")
      # Example output: The function will return the scraped content of 'http://example.com' 
      # and continue to crawl any other pages linked from 'http://example.com'.
      """
      visited = set()
      queue = [url] 
      
      while queue:
          curr = queue.pop(0)
          visited.add(curr) 
          response = requests.get(curr)
          
          if response.ok:
              soup = BeautifulSoup(response.text, 'html.parser')
  
              # scrape the page here 
  
              # find all the links
              links = soup.find_all('a', href=re.compile('^http')) 
              
              for link in links:
                  if link['href'] not in visited:
                      queue.append(link['href'])
  
output:     content = soup.get_text()
      print(content)
  
      return content