input: def remove_whitespace(word_list):
      return [word.strip() for word in word_list]
  
  assert remove_whitespace(['Hello  World  ', 'Hi  there', 'Good  Morning'])==['HelloWorld', 'Hithere', 'GoodMorning']
  assert remove_whitespace(['  test  ', '  case  ', '  second '])==['test', 'case', 'second']
  assert remove_whitespace(['    ', '', ' no spaces '])==['', '', 'nospaces']
  assert remove_whitespace(['only', ' few', ' leading'])==['only', 'few', 'leading']
  assert remove_whitespace([])==[]
output:     return [word.replace(" ", "") for word in word_list]