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Hi there,

That code is just an example of what you’d need to do.

Try this:

add_filter( 'get_the_excerpt', function( $excerpt ) {
    if ( has_excerpt( get_the_ID() ) ) {
        $excerpt .= sprintf( 
            '...<a href="%1$s">&ensp;►►►</a>',
            get_permalink()
        );
    }

    return $excerpt;
} );