input: Write a function that removes all vowels from a given string. If the given string is empty then return an empty string.
  def remove_vowels(string):
      vowels = ['a','e','i','o','u']
      new_string = ''
      for char in string:
          if char.lower() not in vowels:
              new_string += char
      return new_string
  
  assert remove_vowels("Hello World")=="Hll Wrld"
  assert remove_vowels("Python Programming")=="Pythn Prgrmmng"
  assert remove_vowels("The quick brown fox jumps over the lazy dog")=="Th qck brwn fx jmps vr th lzy dg"
  assert remove_vowels("")==""
output: def remove_vowels(string):
      vowels = ['a','e','i','o','u']
      new_string = ''
      for char in string:
          if char.lower() not in vowels:
              new_string += char
      return new_string