diff --git a/libftasm/.gitignore b/libftasm/.gitignore
index a7f4f03f..4be147d0 100644
--- a/libftasm/.gitignore
+++ b/libftasm/.gitignore
@@ -1,3 +1,2 @@
-libft.a
+test
 libfts.a
-main
diff --git a/libftasm/Makefile b/libftasm/Makefile
index 7cd2c123..4032b44f 100644
--- a/libftasm/Makefile
+++ b/libftasm/Makefile
@@ -18,10 +18,12 @@ NASM		=	nasm
 UNAME_S		=	$(shell uname -s)
 ifeq ($(UNAME_S),Linux)
 	FLAGS_ASM	=	-f elf64\
+					-D READ=0x0000000\
 					-DWRITE=0x0000001
 endif
 ifeq ($(UNAME_S),Darwin)
 	FLAGS_ASM	=	-f macho64\
+					-D READ=0x2000003\
 					-DWRITE=0x2000004
 endif
 
@@ -50,6 +52,8 @@ ft_memset.s\
 ft_memcpy.s\
 ft_strdup.s\
 \
+ft_cat.s\
+\
 ft_islower.s\
 ft_isupper.s\
 ft_putchar.s\
diff --git a/libftasm/srcs/ft_cat.s b/libftasm/srcs/ft_cat.s
new file mode 100644
index 00000000..d174b885
--- /dev/null
+++ b/libftasm/srcs/ft_cat.s
@@ -0,0 +1,35 @@
+global _ft_cat
+global ft_cat
+
+extern ft_putchar
+
+%define STDOUT			1
+%define BUFF_SIZE		10
+
+section .bss
+	buf: resb BUFF_SIZE
+
+section .text
+
+_ft_cat:						; void ft_cat(int fd)
+ft_cat:
+	push	rdi
+	lea		rsi, [rel buf]
+	mov		rdx, BUFF_SIZE
+	mov		rax, READ			; int read(int fd, void *buf, size_t count)
+	syscall
+	cmp		rax, 0
+	jle		end
+
+    mov     rdi, STDOUT
+    mov     rdx, rax
+    mov     rax, WRITE			; int write(int fd, const void *buf, size_t count)
+    syscall
+	cmp		rax, 0
+	jl		end
+
+	pop		rdi
+    jmp		ft_cat
+end:		
+	pop		rax
+	ret
diff --git a/libftasm/srcs/ft_puts.s b/libftasm/srcs/ft_puts.s
index 9b0ecd55..ef32493e 100644
--- a/libftasm/srcs/ft_puts.s
+++ b/libftasm/srcs/ft_puts.s
@@ -6,7 +6,8 @@ extern ft_putchar
 
 %define STDOUT			1
 
-ft_puts:						; int puts(const char *s)
+_ft_puts:						; int puts(const char *s)
+ft_puts:
 	push	rdi
     call    ft_strlen
 	pop		rdi
diff --git a/libftasm/srcs/ft_tolower.s b/libftasm/srcs/ft_tolower.s
index 7ad14cfe..d2f66dc2 100644
--- a/libftasm/srcs/ft_tolower.s
+++ b/libftasm/srcs/ft_tolower.s
@@ -3,11 +3,11 @@ global ft_tolower
 
 _ft_tolower:
 ft_tolower:
-	mov rax, rdi
-	cmp rdi, 'A'
-	jl end
-	cmp rdi, 'Z'
-	jg end
-	add rax, 32
+	mov		rax, rdi
+	cmp		rdi, 'A'
+	jl		end
+	cmp		rdi, 'Z'
+	jg		end
+	add		rax, 32
 end:
 	ret
diff --git a/libftasm/test.c b/libftasm/test.c
index a0774743..7881574c 100644
--- a/libftasm/test.c
+++ b/libftasm/test.c
@@ -405,16 +405,18 @@ int test_strdup()
 	return (0);
 }
 
-/* int test_cat(char ** argv) */
-/* { */
-/* 	ft_putstr(__func__); ft_putstr(":\n"); */
-/* 	ft_putstr("Wait for a user input:\n"); */
-/* 	ft_cat(0); */
-/* 	ft_cat(open(__FILE__, O_RDONLY)); */
-/* 	ft_cat(open(argv[0], O_RDONLY)); */
-/* 	ft_cat(-42); */
-/* 	return (0); */
-/* } */
+int test_cat(char ** argv)
+{
+	ft_putstr(__func__); ft_putstr(":\n");
+	/* ft_putstr("Wait for a user input:\n"); */
+	/* ft_cat(0); */
+	ft_putstr("\ntest.c:\n");
+	ft_cat(open(__FILE__, O_RDONLY));
+	ft_putstr("\ntest binary:\n");
+	ft_cat(open(argv[0], O_RDONLY));
+	ft_cat(-42);
+	return (0);
+}
 
 int test_isupper()
 {
@@ -491,12 +493,12 @@ int main(int argc, char **argv)
 	ft_putstr("\nPART BONUS:\n_______\n");
 	if (test_isupper() ||
 			test_islower() ||
-			test_isupper() ||
-			test_putchar())
+			test_isupper())
+			/* test_putchar()) */
+		return (1);
+	ft_putstr("\nPART 3:\n_______\n");
+	if (test_cat(argv))
 		return (1);
-	/* ft_putstr("\nPART 3:\n_______\n"); */
-	/* /1* if (test_cat(argv)) *1/ */
-	/* /1* 	return (1); *1/ */
 	puts("\033c\n\033[38;5;117mALL PASSED:\n___________\n\033[0m");
 	return (0);
 }