input: Write a python function to remove vowels from a given string.
  assert removeVowels("Hello")=="Hll"
  assert removeVowels("beautiful")=="btfl"
  assert removeVowels("education")=="dctn"
output: def removeVowels(s):
      vowels = "aeiouAEIOU"
      return ''.join([char for char in s if char not in vowels])