code: def build_github_url(
      repo,
      branch=None,
      path='requirements.txt',
      token=None
  ):
      
  
      repo = re.sub(r"^http(s)?://github.com/", "", repo).strip('/')
  
      # args come is as 'None' instead of not being provided
      if not path:
          path = 'requirements.txt'
  
      if not branch:
          branch = get_default_branch(repo)
  
      url = 'https://raw.githubusercontent.com/{}/{}/{}'.format(
          repo, branch, path
      )
  
      if token:
          url = '{}?token={}'.format(url, token)
  
      return url
docs: Builds a URL to a file inside a Github repository.