Function trim

external/httplib.h:2758–2767

inline bool is_space_or_tab(char c) { return c == ' ' || c == '\t'; }

inline std::pair<size_t, size_t> trim(const char *b, const char *e, size_t left,
                                      size_t right) {
  while (b + left < e && is_space_or_tab(b[left])) {
    left++;
  }
  while (right > 0 && is_space_or_tab(b[right - 1])) {
    right--;
  }
  return std::make_pair(left, right);
}

inline std::string trim_copy(const std::string &s) {
  auto r = trim(s.data(), s.data() + s.size(), 0, s.size());