input: Write a function named remove_whitespace that takes a list of strings as input and returns a new list with all the whitespaces removed from each string. If the input list is empty, return an empty list.
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning'])==['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace(['  Python   ', '  is ', '  fun  '])==['Python', 'is', 'fun']
  assert remove_whitespace([''])==['']
  assert remove_whitespace([])==[]
output: def remove_whitespace(strings):
      return [''.join(s.split()) for s in strings]