code: public static void insert(String key, String... split) {
          Forest forest = get(key);
          StringBuilder sb = new StringBuilder();
          if (split.length % 2 != 0) {
              LOG.error("init ambiguity  error in line :" + Arrays.toString(split) + " format err !");
              return;
          }
          for (int i = 0; i < split.length; i += 2) {
              sb.append(split[i]);
          }
          forest.addBranch(sb.toString(), split);
      }
docs: 插入到树中呀
  
  @param key
  @param split
  @return