exercism/cpp/log-levels/log_levels.cpp

#include <string>

namespace log_line {
std::string message(std::string line) {
  return line.substr(line.find(" ") + 1);
}

std::string log_level(std::string line) {
  return line.substr(1, line.find("]") - 1);
}

std::string reformat(std::string line) {

  return message(line) + " (" + log_level(line) + ")";
}
} // namespace log_line