input: Write a python function to remove all the vowels from the given string.
  assert remove_vowels("Hello World!") == "Hll Wrld!"
  assert remove_vowels("Python Programming") == "Pythn Prgrmmng"
  assert remove_vowels("Beautiful Day") == "Btf Day"
output: def remove_vowels(string):
      vowels = "aeiouAEIOU"
      return ''.join(char for char in string if char not in vowels)