docs: protected void checkNotSubPath(String source, String target) {
  
          source = CmsStringUtil.joinPaths("/", source, "/");
          target = CmsStringUtil.joinPaths("/", target, "/");
          if (target.startsWith(source)) {
              throw new CmsIllegalArgumentException(
                  org.opencms.file.Messages.get().container(
                      org.opencms.file.Messages.ERR_REWRITE_LINKS_ROOTS_DEPENDENT_2,
                      source,
                      target));
          }
      }