static public String normalizeWWN(String wwn){
  String result=wwn;
  if (wwn != null && !wwn.isEmpty()) {
    result=wwn.replaceAll("[^A-Fa-f0-9]","");
    result=result.toUpperCase();
  }
  return result;
}

static public String normalizeWWN ( String wwn ) { String result = wwn ; if ( wwn != null && ! wwn . isEmpty ( ) ) { result = wwn . replaceAll ( "[^A-Fa-f0-9]" , "" ) ; result = result . toUpperCase ( ) ; } return result ; }
utility function that normalize the volume wwn , so that it only contains upper case hex numbers
