protected List<String> addWhitespace(List<String> list){
  List<String> whitespaceList=new ArrayList<>();
  for (  String value : list) {
    whitespaceList.add(addWhitespace(value));
  }
  return whitespaceList;
}

protected List < String > addWhitespace ( List < String > list ) { List < String > whitespaceList = new ArrayList < > ( ) ; for ( String value : list ) { whitespaceList . add ( addWhitespace ( value ) ) ; } return whitespaceList ; }
adds leading and trailing whitespace characters to all members in this list .
