code: public Attachment getAttachment(String label) {
      for (Attachment attachment : attachmentList) {
        if (attachment.getLabel().equalsIgnoreCase(label)) {
          return attachment;
        }
      }
      return null;
    }
docs: get a specific attachment by passing in a label
  
  @param label : unique for each attach point
  @return Attachment or null if there is no such attach point