diff --git a/codes/builtins/builtin_wrapper.c b/codes/builtins/builtin_wrapper.c
index 6f0eb54..368f2bd 100644
--- a/codes/builtins/builtin_wrapper.c
+++ b/codes/builtins/builtin_wrapper.c
@@ -6,7 +6,7 @@
 /*   By: kyungjle <kyungjle@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/27 06:04:49 by nicknamemoh       #+#    #+#             */
-/*   Updated: 2024/04/09 15:07:35 by kyungjle         ###   ########.fr       */
+/*   Updated: 2024/04/09 21:04:40 by kyungjle         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -49,19 +49,19 @@ t_bool	builtin_isbuiltin(char *name)
 */
 t_bool	builtin_isbuiltin(char *name)
 {
-	if (ft_strncmp(name, "cd", 2) == 0)
+	if (ft_strlen(name) == 2 && ft_strncmp(name, "cd", 2) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "pwd", 3) == 0)
+	else if (ft_strlen(name) == 3 && ft_strncmp(name, "pwd", 3) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "echo", 4) == 0)
+	else if (ft_strlen(name) == 4 && ft_strncmp(name, "echo", 4) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "exit", 4) == 0)
+	else if (ft_strlen(name) == 5 && ft_strncmp(name, "exit", 4) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "export", 6) == 0)
+	else if (ft_strlen(name) == 6 && ft_strncmp(name, "export", 6) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "unset", 5) == 0)
+	else if (ft_strlen(name) == 5 && ft_strncmp(name, "unset", 5) == 0)
 		return (TRUE);
-	else if (ft_strncmp(name, "env", 3) == 0)
+	else if (ft_strlen(name) == 3 && ft_strncmp(name, "env", 3) == 0)
 		return (TRUE);
 	return (FALSE);
 }
diff --git a/codes/loader/ldexec_run.c b/codes/loader/ldexec_run.c
index 5ae22cc..5d06ac1 100644
--- a/codes/loader/ldexec_run.c
+++ b/codes/loader/ldexec_run.c
@@ -6,7 +6,7 @@
 /*   By: kyungjle <kyungjle@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/14 01:11:55 by nicknamemoh       #+#    #+#             */
-/*   Updated: 2024/04/09 17:46:44 by kyungjle         ###   ########.fr       */
+/*   Updated: 2024/04/09 21:13:03 by kyungjle         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -37,6 +37,8 @@ pid_t	ldexec_run_bin(t_ld_exec exec, pid_t pid)
 		signal(SIGQUIT, SIG_DFL);
 		if (errno != 0)
 			do_exit("ldexec_run_bin.signal");
+		if (exec.argv[0][0] == '\0')
+			exit(EXIT_SUCCESS);
 		if (execve(exec.path, exec.argv, exec.envp) < 0)
 			do_exit("ldexec_run_bin.execve");
 	}
diff --git a/codes/loader/ldpre_ast_redir2.c b/codes/loader/ldpre_ast_redir2.c
index 08c3411..dce489e 100644
--- a/codes/loader/ldpre_ast_redir2.c
+++ b/codes/loader/ldpre_ast_redir2.c
@@ -3,10 +3,10 @@
 /*                                                        :::      ::::::::   */
 /*   ldpre_ast_redir2.c                                 :+:      :+:    :+:   */
 /*                                                    +:+ +:+         +:+     */
-/*   By: nicknamemohaji <nicknamemohaji@student.    +#+  +:+       +#+        */
+/*   By: kyungjle <kyungjle@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/04/04 18:41:08 by kyungjle          #+#    #+#             */
-/*   Updated: 2024/04/09 20:53:03 by nicknamemoh      ###   ########.fr       */
+/*   Updated: 2024/04/09 21:01:10 by kyungjle         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
diff --git a/codes/utils/ld_map_functions2.c b/codes/utils/ld_map_functions2.c
index 7795496..1207b6e 100644
--- a/codes/utils/ld_map_functions2.c
+++ b/codes/utils/ld_map_functions2.c
@@ -79,30 +79,27 @@ char	*ldpre_env_fetch(char *key, t_ld_map_env *map)
 void	ldpre_env_add(char *key, char *value, t_ld_map_env *map)
 {
 	t_ld_map_node	*node;
-	char			*key_copy;
-	char			*value_copy;
 
 	if (!ldpre_env_validate_key(key))
 	{
-		printf("syntax error: [%s]\n", key);
+		printf("export: syntax error: [%s]\n", key);
+		free(key);
+		free(value);
 		return ;
 	}
 	ldpre_env_remove(key, map);
 	node = malloc(sizeof(t_ld_map_node) * 1);
 	if (node == NULL)
 		do_exit("ldpre_env_add.malloc");
-	key_copy = ft_strdup(key);
-	value_copy = ft_strdup(value);
-	if (key_copy == NULL || value_copy == NULL)
-		do_exit("ldpre_env_add.ft_strdup");
+	node->key = ft_strdup(key);
+	node->value = ft_strdup(value);
 	free(key);
 	free(value);
-	node->key = key_copy;
-	node->value = value_copy;
 	node->next = NULL;
+	if (node->key == NULL || node->value == NULL)
+		do_exit("ldpre_env_add.ft_strdup");
 	ld_map_node_attach(map, node);
-	map->count++;
-	return ;
+	map->count += 1;
 }
 
 t_bool	ldpre_env_remove(char *key, t_ld_map_env *map)