bool contrac_generate_tracing_key(Contrac * data);
bool contrac_set_day_number(Contrac * data, uint32_t day_number);
bool contrac_set_time_interval_number(Contrac * data, uint8_t time_interval_number);
bool contrac_generate_tracing_key(Contrac * data);
bool contrac_set_day_number(Contrac * data, uint32_t day_number);
bool contrac_set_time_interval_number(Contrac * data, uint8_t time_interval_number);