input: 
  def remove_vowels(string):
      """ Remove all vowels from the given string.
      >>> remove_vowels("Hello World")
      'Hll Wrld'
      >>> remove_vowels("Python Programming")
      'Pythn Prgrmmng'
      """
      vowels = ['a','e','i','o','u']
      new_string = ''
      for char in string:
          if char.lower() not in vowels:
              new_string += char
      return new_string
  
output:     vowels = ['a','e','i','o','u']
      new_string = ''
      for char in string:
          if char.lower() not in vowels:
              new_string += char
      return new_string