diff --git a/ft_printf.c b/ft_printf.c
index 95ae47d..45b607e 100644
--- a/ft_printf.c
+++ b/ft_printf.c
@@ -6,7 +6,7 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2020/03/12 22:31:29 by hulamy            #+#    #+#             */
-/*   Updated: 2020/03/12 23:24:13 by hulamy           ###   ########.fr       */
+/*   Updated: 2020/06/30 00:41:35 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/main.c b/main.c
index 465cd6c..2d13c62 100644
--- a/main.c
+++ b/main.c
@@ -27,9 +27,7 @@ int		ft_printf(char *string, ...);
 		/* redirect output to file outft, and write result of ft_printf inside it */\
 		/* also compare return of both printf and ft_printf, pout and ftpout */\
 		dup2(outft, 1); \
-		printf("_x_%s_x_",##args);\
 		ftpout = ft_printf(string, ##args); \
-		write(1, "a", 1);\
 		if (ftpout == -1) printf("\033[91mERROR\033[0m"); \
 		fflush(stdout); \
 		printf("\n"); \
diff --git a/srcs/ft_convert.c b/srcs/ft_convert.c
index 12ba62b..686fe68 100644
--- a/srcs/ft_convert.c
+++ b/srcs/ft_convert.c
@@ -6,7 +6,7 @@
 /*   By: hulamy <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2020/03/12 22:30:05 by hulamy            #+#    #+#             */
-/*   Updated: 2020/03/12 22:30:20 by hulamy           ###   ########.fr       */
+/*   Updated: 2020/06/30 00:40:49 by hulamy           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -57,7 +57,7 @@ char	*conv_u(char c, unsigned long int i)
 	char	*s;
 
 	if (c == 's')
-		return (strdup((char *)i));
+		return (i == 0 ? ft_strdup("(null)") : ft_strdup((char *)i));
 	s = ft_utoa(i);
 	if (c == 'u')
 		return (s);