old_contents: __version__ = "0.1"
  
new_contents: __version__ = "0.1"
  
  import requests
  import io
  import tarfile
  
  import ccr
  
  def get_source_files(pkgname, workingdir):
      """Download the source tarball and extract it"""
      r = requests.get(ccr.getpkgurl(pkgname))
      tar = tarfile.open(mode='r', fileobj=io.BytesIO(r.content))
      tar.extractall(workingdir)
  
subject: Add initial function for get_source_files