input: def scrape_webpage_links(URL: str) -> List[str]:
      """
      This function builds a web scraper in Python that collects all the links from a given website URL.
  
      >>> scrape_webpage_links("http://www.example.com/")
      ['http://www.example.com/about', 'http://www.example.com/contact', 'http://www.example.com/services']
      """
      import requests as req
      from bs4 import BeautifulSoup
      
      # GET request
      r = req.get(URL)
      
      # parse the downloaded homepage and grab all text
      soup = BeautifulSoup(r.text, "html.parser")
      
      # find and return all links
      links = [link.get('href') for link in soup.find_all('a')]
      return links
output:     filtered_links = []
      for link in links:
          if link and link.startswith('http'):
              filtered_links.append(link)
      return filtered_links