Custom Meta for JNews - Module 3 || Add Category

/* Custom Meta for JNews - Module 3 || Add Category */
function custom_post_meta_1_module_3(  $output, $post, $instance ) {
    if ( get_class( $instance ) === 'JNews\Module\Block\Block_3_View' ) {
        $output = '';
        $block_3_class = JNews\Module\Block\Block_3_View::getInstance();
        if ( get_theme_mod( 'jnews_show_block_meta', true ) ) {
            $comment    = jnews_get_comments_number( $post->ID );
            $view_count = jnews_meta_views( $post->ID );

            // author detail
            $author        = isset( $post->post_author ) ? $post->post_author : 'rss_post';
            $is_rss        = jnews_get_rss_post_id( $author );
            $author_url    = $is_rss ? ( isset( $post->post_author_url ) ? $post->post_author_url : '' ) : get_author_posts_url( $author );
            $author_name   = $is_rss ? $post->post_author_name : get_the_author_meta( 'display_name', $author );
            $author_avatar = ( $is_rss ? false : $avatar) ?
                '<div class="jeg_author_avatar">
                    ' . get_avatar( get_the_author_meta( 'ID', $post->post_author ), 80, null, get_the_author_meta( 'display_name', $post->post_author ) ) . '
                </div>' : '';

            $trending = ( vp_metabox( 'jnews_single_post.trending_post', null, $post->ID ) ) ? "<div class=\"jeg_meta_trending\"><a href=\"" . get_the_permalink( $post ) . "\"><i class=\"fa fa-bolt\"></i></a></div>" : "";

            if ( jnews_is_review( $post->ID ) ) {
                $rating = jnews_generate_rating( $post->ID, 'jeg_landing_review' );

                $output .= "<div class=\"jeg_post_meta\">";
                $output .= $trending;
                $output .= get_theme_mod( 'jnews_show_block_meta_rating', true ) ? $rating : "";
                $output .= get_theme_mod( 'jnews_show_block_meta_author', true ) ? ( jnews_check_coauthor_plus() ? "<div class=\"jeg_meta_author coauthor\">" . jnews_get_author_coauthor( $post->ID, false, 'by', 1 ) . "</div>" : "<div class=\"jeg_meta_author\"><span class=\"by\">" . jnews_return_translation( 'by', 'jnews', 'by' ) . "</span> <a href=\"{$author_url}\">{$author_name}</a></div>" ) : "";
                /* Start Custom */
                $output .= "<div class=\"jeg_post_category\">";
                $output .= "<span> In " . $block_3_class->get_primary_category ($post->ID ) . "</span>";
                $output .= "</div>";
                /* End Custom */
                $output .= "</div>";
            } else {
                $output .= "<div class=\"jeg_post_meta\">";
                $output .= $trending;
                $output .= get_theme_mod( 'jnews_show_block_meta_author', true ) ? ( jnews_check_coauthor_plus() ? "<div class=\"jeg_meta_author coauthor\">" . jnews_get_author_coauthor( $post->ID, $avatar, 'by', 1 ) . "</div>" : "<div class=\"jeg_meta_author\">" . $author_avatar . "<span class=\"by\">" . jnews_return_translation( 'by', 'jnews', 'by' ) . "</span> <a href=\"{$author_url}\">{$author_name}</a></div>" ) : "";
                $output .= get_theme_mod( 'jnews_show_block_meta_date', true ) ? "<div class=\"jeg_meta_date\"><a href=\"" . get_the_permalink( $post ) . "\"><i class=\"fa fa-clock-o\"></i> " . $block_3_class->format_date( $post ) . "</a></div>" : "";
                $output .= get_theme_mod( 'jnews_show_block_meta_comment', true ) && ! $feed ? "<div class=\"jeg_meta_comment\"><a href=\"" . jnews_get_respond_link( $post->ID ) . "\" ><i class=\"fa fa-comment-o\"></i> {$comment} </a></div>" : "";
                $output .= get_theme_mod( 'jnews_show_block_meta_views', false ) && ! $feed ? "<div class=\"jeg_meta_views\"><a href=\"" . get_the_permalink( $post->ID ) . "\" ><i class=\"fa fa-eye\"></i> {$view_count} </a></div>" : "";
                /* Start Custom */
                $output .= "<div class=\"jeg_post_category\">";
                $output .= "<span> In " . $block_3_class->get_primary_category ($post->ID ) . "</span>";
                $output .= "</div>";
                /* End Custom */
                $output .= "</div>";
            }
        }
        return $output;
    }
    return $output;
}
add_filter( 'jnews_module_post_meta_1', 'custom_post_meta_1_module_3', null, 3 );