fix memory leaks

cmd/option.c

@@ -16,6 +16,33 @@ struct b_command_option *b_command_option_create(void)
 	return out;
 }
 
+void b_command_option_destroy(struct b_command_option *opt)
+{
+	if (opt->opt_long_name) {
+		free(opt->opt_long_name);
+	}
+
+	if (opt->opt_description) {
+		free(opt->opt_description);
+	}
+
+	b_queue_iterator it = {0};
+
+	b_queue_iterator_begin(&opt->opt_args, &it);
+	while (b_queue_iterator_is_valid(&it)) {
+		struct b_command_arg *arg
+			= b_unbox(struct b_command_arg, it.entry, arg_entry);
+		if (!arg) {
+			break;
+		}
+
+		b_queue_iterator_erase(&it);
+		b_command_arg_destroy(arg);
+	}
+
+	free(opt);
+}
+
 b_status b_command_option_set_long_name(
 	struct b_command_option *opt, const char *name)
 {