ADDED   Makefile
Index: Makefile
==================================================================
--- /dev/null
+++ Makefile
@@ -0,0 +1,39 @@
+aoc: *.c *.h
+	gcc -std=c2x -pedantic \
+	-D_XOPEN_SOURCE=800 \
+	-flto \
+	-O3 -DNDEBUG \
+	*.c \
+	-o aoc
+
+aocdbg: *.c *.h
+	gcc -std=c2x -pedantic \
+	-D_XOPEN_SOURCE=800 \
+	-Werror -Wall -Wextra \
+	-Wbad-function-cast \
+	-Wcast-align \
+	-Wcast-qual \
+	-Wconversion \
+	-Wfloat-equal \
+	-Wformat=2 \
+	-Wformat-signedness \
+	-Winline \
+	-Wlogical-op \
+	-Wnested-externs \
+	-Wno-missing-braces \
+	-Wno-missing-field-initializers \
+	-Wold-style-definition \
+	-Wpointer-arith \
+	-Wredundant-decls \
+	-Wshadow \
+	-Wstrict-aliasing=2 \
+	-Wstrict-overflow=5 \
+	-Wstrict-prototypes \
+	-Wswitch-default \
+	-Wswitch-enum \
+	-Wundef \
+	-Wunreachable-code \
+	-fno-omit-frame-pointer -ffloat-store -fno-common -fstrict-aliasing \
+	-Og -ggdb3 \
+	*.c \
+	-o aocdbg