Function Join

paddle/cinn/utils/string.h:49–55

 */
template <typename T = std::string>
std::string Join(const std::vector<T>& fields, const std::string& splitter) {
  if (fields.empty()) return "";
  std::stringstream ss;
  for (int i = 0; i < fields.size() - 1; i++) ss << fields[i] << splitter;
  ss << fields.back();
  return ss.str();
}

std::vector<std::string> Split(const std::string& str,
                               const std::string& splitter);