code: public static String printCommentTree(List<CommentTreeElement> cs) {
          StringBuilder builder = new StringBuilder();
          for (CommentTreeElement c : cs) {
              builder.append(printCommentTree(c, 0));
          }
          return builder.toString();
      }
docs: Get printable version of the given comment tree.
  
  @param cs     List of comment tree elements
  
  @return Printable comment tree