input: Write a python function to remove vowels from a given string.
  assert removeVowels('My name is John') == 'My nm s Jhn'
  assert removeVowels('Hello World') == 'Hll Wrld'
  assert removeVowels('Python Programming') == 'Pythn Prgrmmng'
output: def removeVowels(s):
      vowels = "aeiouAEIOU"
      return ''.join([char for char in s if char not in vowels])