chicken egg incubator control code

Bug found in turnerCountForDisplay

if (prev_clock_day != clock.dayOfMonth) {
		hatchCountUp++;
		hatchDays = hatchDays - hatchCountUp;

let say hatch days are 19

first day:
hatchDays = 19
hatchCountUp = 0
result=19

secound day:
hatchDays = 19
hatchCountUp = 1
result=18

third day:
hatchDays = 18
hatchCountUp = 2
result=16

in fact exist there an variable u isn't in use
int t1_hatch_days = 15;