input: Write a function that takes a list of strings and removes all the whitespaces from each string. If the input list is empty, return an empty list.
  
  def remove_whitespace(word_list):
      return [word.replace(" ", "") for word in word_list]
  
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning']) == ['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace([]) == []
output: def remove_whitespace(word_list):
      return [word.replace(" ", "") for word in word_list]