input: 
  def remove_vowels(string: str) -> str:
      """ Remove all vowels from the given string.
      >>> remove_vowels('Hello World')
      'Hll Wrld'
      >>> remove_vowels('Python Programming')
      'Pythn Prgrmmng'
      """
  
output:     vowels = "aeiouAEIOU"
      result = ""
      for char in string:
          if char not in vowels:
              result += char
      return result