Method get_token_string

external/json/json.hpp:8253–8258

! @return a string representation of the last read byte */

    @return a string representation of the last read byte
    */
    std::string get_token_string() const
    {
        char cr[3];
        snprintf(cr, 3, "%.2hhX", static_cast<unsigned char>(current));
        return std::string{cr};
    }

    /*!
    @param[in] format   the current format