WordPress Template Redirect & Template Include

function custom_redirects() {
 
    if ( is_front_page() ) {
        wp_redirect( home_url( '/dashboard/' ) );
        die;
    }
 
    if ( is_page('contact') ) {
        wp_redirect( home_url( '/new-contact/' ) );
        die;
    }
 
}
add_action( 'template_redirect', 'custom_redirects' );

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add_filter( 'template_include', 'portfolio_page_template', 99 );
function portfolio_page_template( $template ) {
    if ( is_page( 'portfolio' )  ) {
        $new_template = locate_template( array( 'portfolio-page-template.php' ) );
    if ( '' != $new_template ) {
        return $new_template ;
    }
    }
    return $template;
}