standard posted_in function with custom_taxonomy

I tried to modify standard twenty_ten function which print post’s categories and tags. I just need to post also custom taxonomy’s category.

function posted_in() {
	// Retrieves tag list of current post, separated by commas.
	$tag_list = get_the_tag_list( '', ', ' );
	if ( $tag_list&&is_object_in_taxonomy( get_post_type(), 'custom_taxonomy' ) ) {
		$posted_in = __( 'Posted in: %3$s </br> Tagged with: %2$s');
	} elseif( is_object_in_taxonomy( get_post_type(), 'custom_taxonomy' ) ){
		$posted_in = __( 'Posted in: %3$s');
	} elseif ( is_object_in_taxonomy( get_post_type(), 'category' ) ) {
		$posted_in = __( 'Posted in: %1$s');
	}else {
		$posted_in = __( '');
	}

	printf(
		$posted_in,
		get_the_category_list( ', ' ),
		$tag_list,
		get_permalink(),
		the_title_attribute( 'echo=0' ),
		$custom_taxonomy,
		get_the_category_list( ', ' )
	);
}
endif;

I don’t know why it replace category list with post URL.