Remove author from WordPress Author Url

functions.php

add_filter('author_rewrite_rules', 'no_author_base_rewrite_rules');
function no_author_base_rewrite_rules($author_rewrite) {
   global $wpdb;
   $author_rewrite = array();
   $authors = $wpdb->get_results("SELECT user_nicename AS nicename from $wpdb->users");
   foreach($authors as $author) {
       $author_rewrite["({$author->nicename})/page/?([0-9]+)/?$"] = 'index.php?author_name=$matches[1]&paged=$matches[2]';
       $author_rewrite["({$author->nicename})/?$"] = 'index.php?author_name=$matches[1]';
   }
   return $author_rewrite;
}

if( !is_admin() ) {
	add_action('init', 'author_rewrite_so_22115103');
}

function author_rewrite_so_22115103() {
   global $wp_rewrite;
   if( 'author' == $wp_rewrite->author_base ) $wp_rewrite->author_base = null;
}

Must save permalinks from Settings >> Permalinks to get this working after implementation.