input: Write a function to detect all vowels in a given string. If vowels are found, return them as a list. If no vowels are found, return an empty list.
  def vowelCheck(inputString): 
      vowels = ['a','e','i','o','u','A','E','I','O','U'] 
      result = [x for x in inputString if x in vowels]
      return result
  assert vowelCheck("Hello World")==['e', 'o', 'o']
  assert vowelCheck("Brrr!")==[]
  assert vowelCheck("AEIOUaeiou")==['A', 'E', 'I', 'O', 'U', 'a', 'e', 'i', 'o', 'u']
output: def vowelCheck(inputString): 
      vowels = ['a','e','i','o','u','A','E','I','O','U'] 
      result = [x for x in inputString if x in vowels]
      return result