input: from typing import List
  
  def filter_vowels(string: List[str]) -> str:
      """ Given a string, this function filters out all the vowels and returns
      the string without the vowels.
      >>> filter_vowels('abcdefg')
      'bcdfg'
      >>> filter_vowels('AEIOUaeiou')
      ''
      """
output:     vowels = "aeiouAEIOU"
      return ''.join([char for char in string if char not in vowels])