fixes

srcs/execution/exec.c

@@ -14,7 +14,7 @@
 
 int	execute_command(t_ast_n *node)
 {
-	if (!node->cmd)
+	if (!node || (node->state  == _CMD && node->cmd == NULL))
 		return (0);
 	if (node->state == _CMD)
 		handle_redir(node);

srcs/parsing/heredoc.c

@@ -128,12 +128,15 @@ void	parse_heredoc(char *limiter, t_node *lst, t_msh *msh)
 
 void	create_heredoc(t_node *lst, t_msh *msh)
 {
+	t_node *tmp;
+
+	tmp = lst;
 	while (lst)
 	{
 		if (lst->pressision == HEREDOC && lst->next && lst->next->pressision)
 		{
 			lst = lst->next;
-			parse_heredoc(lst->val, lst, msh);
+			parse_heredoc(lst->val, tmp, msh);
 		}
 		lst = lst->next;
 	}

srcs/parsing/tokenizer/linked_list.c

@@ -53,13 +53,15 @@ int	add_node_back(t_node **head, char *val, t_token token, t_pres pres)
 void	free_linked_list(t_node *head)
 {
 	t_node	*tmp;
+	t_node	*next;
 
-	while (head)
-	{
 	tmp = head;
-		head = head->next;
+	while (tmp)
+	{
+		next = tmp->next;
 		free(tmp->val);
 		free(tmp);
+		tmp = next;
 	}
 }