bool contrac_set_time_interval_number(Contrac * data, uint8_t time_interval_number);
bool contrac_update_current_time(Contrac * data);
bool contrac_get_initialised(Contrac const * data);
bool contrac_set_time_interval_number(Contrac * data, uint8_t time_interval_number);
bool contrac_update_current_time(Contrac * data);
bool contrac_get_initialised(Contrac const * data);