Function join

src/util/split.h:21–28

TODO support bool skip_empty = false

// TODO support bool skip_empty = false
inline std::string join(const std::vector<std::string> &elems, const string& delim) {
  std::string str;
  for (int i = 0; i < elems.size() - 1; ++i) {
    str += elems[i] + delim;
  }
  str += elems.back();
  return str;
}

} // namespace PS