input: Write a function to build a web scraper in Python that collects all the links from a given website. The function should return a list of all the URLs found on the website. If the website connection fails or no links are found, the function should return an empty list.
  assert collect_links("http://www.example.com/")==['http://www.example.com/', 'http://www.iana.org/domains/example']
  assert collect_links("http://www.nonexistentwebsite.com/")==[]
  assert collect_links("http://www.websitewithnolinks.com/")==[]
output: import requests
  from bs4 import BeautifulSoup
  
  def collect_links(url):
      try:
          response = requests.get(url)
          response.raise_for_status()
      except requests.RequestException:
          return []
      
      soup = BeautifulSoup(response.text, 'html.parser')
      links = [a['href'] for a in soup.find_all('a', href=True)]
      
      return links