docs: public static void buildRowKeys(OrganigramNode node) {
          if (node.getChildren() != null && !node.getChildren().isEmpty()) {
              for (int i = 0; i < node.getChildren().size(); i++) {
                  OrganigramNode childNode = node.getChildren().get(i);
  
                  String childRowKey = (node.getParent() == null) ? String.valueOf(i) : node.getRowKey() + "_" + i;
                  childNode.setRowKey(childRowKey);
  
                  buildRowKeys(childNode);
              }
          }
      }