no more crash on day3

Makefile

@@ -2,8 +2,8 @@ FILES = $(wildcard ./*)
 SRCS  = $(filter %.c,$(FILES))
 BINS  = $(SRCS:%.c=%.elf)
 
-CFLAGS = -Wall -Werror -pedantic -D_GNU_SOURCE -std=gnu2y -O3 -g -Wno-unused\
-	     -nostartfiles -static -Ttext=C475000
+CFLAGS = -Wall -Werror -pedantic -Wno-unused -D_GNU_SOURCE -std=gnu2y\
+		 -O3 -g -Ttext=C475000 -static -nostartfiles -fno-stack-protector -march=native
 
 all: $(BINS)