input: 
  def count_vowels(string: str) -> int: 
      """
      Count the total number of vowels in the given string.
      Vowels are defined as 'a', 'e', 'i', 'o', 'u'.
  
      >>> count_vowels("Hello World")
      3
      >>> count_vowels("Python Programming")
      4
      >>> count_vowels("AEIOU")
      5
      """
      vowels = "aeiou"
      count = 0
      for s in string:
          if s.lower() in vowels:
              count += 1
      return count
  
output:     vowels = "aeiou"
      count = 0
      for s in string:
          if s.lower() in vowels:
              count += 1
      return count