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function custom_excerpt( $num_words = 45, $ending = '...', $post_id = null, $more_link = "Read more") {
    global $post;

    // Truncate post content
    $current_post = $post_id ? get_post( $post_id ) : $post;
		$excerpt_content = $current_post->post_excerpt;

		if ($excerpt == '') {
			// If excerpt is empty use content,
			$excerpt = strip_shortcodes( $current_post->post_content );
		} else {
			// If excerpt has content use excerpt
			$excerpt = strip_shortcodes( $current_post->post_excerpt );
		}
    $excerpt = wp_trim_words( $excerpt, $num_words, $ending );
    $excerpt = trim($excerpt);


    // Read more link
    $excerpt .= '<a class="readmore-custom" href="' . get_permalink( $post ) . '" title="' . get_the_title( $post ) . '">' . $more_link . '</a>';

    return $excerpt;
}