#ifndef UTILS_FUNCTIONS_HPP_
#define UTILS_FUNCTIONS_HPP_
struct functions {
    static inline std::string isNull(const nlohmann::json& str) {
        try {
            return str.is_null() ? str.dump() : str.get<std::string>();
        }
        catch (...) {
            return "null";
        }
    }
};
#endif