input: Write a function to remove all the whitespaces from each string in a given list of strings. The function should return a list of strings with all whitespaces removed.
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning'])==['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace(['  Keep learning ', '  Always improve  '])==['Keeplearning', 'Alwaysimprove']
  assert remove_whitespace([])==[]
  assert remove_whitespace(['NoSpace'])==['NoSpace']
  assert remove_whitespace(['   '])==['']
  assert remove_whitespace([''])==['']
output: def remove_whitespace(strings):
      return [s.replace(" ", "") for s in strings]