added ft_free_arr to make file and added include

Makefile

@@ -28,7 +28,7 @@ VPATH	= 	src:src/conversion:src/ft_printf:src/list:src/memory:src/output:\
 SRC_CONVERSION  = 	ft_atoi.c ft_itoa.c ft_tolower.c ft_toupper.c \
 
 SRC_MEMORY = 	ft_memchr.c ft_memcmp.c ft_memcpy.c ft_memmove.c ft_memset.c \
-				ft_bzero.c ft_calloc.c
+				ft_bzero.c ft_calloc.c ft_free_arr.c
 
 SRC_STRING =	ft_isalnum.c ft_isalpha.c ft_isascii.c ft_isdigit.c ft_isprint.c \
 				ft_split.c ft_strchr.c ft_strdup.c ft_striteri.c ft_strjoin.c \

src/memory/ft_free_arr.c

@@ -1,4 +1,5 @@
 #include "libft.h"
+#include <stdlib.h>
 
 void ft_free_arr(char **arr)
 {