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 without any whitespaces.
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning'])==['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace(['  One  ', 'Two  Three', '   FourFiveSix   '])==['One', 'TwoThree', 'FourFiveSix']
  assert remove_whitespace([])==[]
  assert remove_whitespace(['NoWhitespace'])==['NoWhitespace']
output: def remove_whitespace(strings):
      return [s.replace(" ", "") for s in strings]