show no author

Hello,

I would like to be able to select author A to be seen on the article meta, BUT if it is Author B i dont want them to be shown in the meta…i have the following in my child theme functions file..

//
    // Author.
    //
    $author = sprintf( 'Posted by %s   ',
      ( function_exists( 'coauthors' ) && is_singular('post') ) ? coauthors_posts_links() : get_the_author()
    );

https://wordpress.org/plugins/co-authors-plus/