input: from typing import List
  
  
  def filter_vowels(string: str) -> str:
      """
      Remove all vowels from the given string.
  
      >>> filter_vowels('hello world')
      'hll wrld'
      >>> filter_vowels('AEIOUaeiou')
      ''
      """
output:     vowels = "AEIOUaeiou"
      result = [char for char in string if char not in vowels]
      return ''.join(result)