Change module post excerpt to 50 characters only

/**
 * Change post exceprt moodule to 50 word
 * This code will work to Module that have 191 Excerpt Length value
 */

function custom_trim_by_character( $excerpt, $post_id, $length, $excerpt_more ) {
    if ( 191 !== $length ) {
        return $excerpt;
    }
    $post         = get_post( $post_id );
    $post_excerpt = $post->post_excerpt;

    if ( empty( $post_excerpt ) ) {
        $post_excerpt = $post->post_content;
    }

    $post_excerpt = preg_replace( '/\[[^\]]+\]/', '', $post_excerpt );
    $post_excerpt = wp_trim_words( $post_excerpt, 9999, '' );
    $post_excerpt = substr( $post_excerpt, 0, 50 ) . ' ...';

    return $post_excerpt;
}
add_filter( 'jnews_module_excerpt', 'custom_trim_by_character', 10, 4 );