MKDIR = mkdir
CP    = cp

LATEST_YEAR := $(lastword $(sort $(wildcard [0-9]*)))

ifeq ($(LATEST_YEAR),)
	NEW_YEAR := $(shell date -u +%Y)
else
	NEW_YEAR := $(shell echo $$(( $(LATEST_YEAR) + 1 )) )
endif


all: create_year

create_year:
	$(MKDIR) "$(NEW_YEAR)"
	$(CP) "$(LATEST_YEAR)/Makefile" "$(NEW_YEAR)"