code: @Override
      public String build(final RegisteredService service, final String extension) {
          return StringUtils.remove(service.getName(), ' ') + '-' + service.getId() + '.' + extension;
      }
docs: Method creates a filename to store the service.
  
  @param service   - Service to be stored.
  @param extension - extension to use for the file.
  @return - String representing file name.