input: Write a python function to remove dots from a URL string.
  assert remove_dot("https://www.google.com/example/?q=python.") == "https://wwwgooglecom/example/?q=python"
  assert remove_dot("http://www.example.com/test.") == "http://wwwexamplecom/test"
  assert remove_dot("ftp://files.example.com/dir/file.") == "ftp://filesexamplecom/dir/file"
output: def remove_dot(url: str) -> str:
      return url.replace('.', '')