input: Write a function to remove all whitespaces from each string in a list. Return the list with the modified strings.
  
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning'])==['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace(['   Python   ', '   is   ', '   awesome   '])==['Python', 'is', 'awesome']
  assert remove_whitespace([])==[]
  assert remove_whitespace(['   '])==['']
  assert remove_whitespace(['NoSpaces', 'Here'])==['NoSpaces', 'Here']
output: def remove_whitespace(strings):
      return [s.replace(" ", "") for s in strings]