<?php
    if ( have_posts() ) : ?>

            <header class="page-header">
                <h1>Subcategories</h1>
            </header><!-- .page-header -->
            <div class="row">
                <div class="col-sm-12">

        <?php

            /*
             * Include the Post-Format-specific template for the content.
             * If you want to override this in a child theme, then include a file
             * called content-___.php (where ___ is the Post Format name) and that will be used instead.
             */

                $term = get_queried_object();
                $term_id = $term->term_id;
                $taxonomy_name = $term->taxonomy;

                $termchildren = get_term_children( $term_id, $taxonomy_name );

                echo '<ul>';
                foreach ( $termchildren as $child ) {
                    $term = get_term_by( 'id', $child, $taxonomy_name );
                    echo '<li><a href="' . get_term_link( $term, $taxonomy_name ) . '">' . $term->name . '</a></li>';
                }
                echo '</ul>';

                wp_link_pages( array(
                    'before' => '<div class="page-links">' . esc_html__( 'Pages:', 'fernox' ),
                    'after'  => '</div>',
                ) );

        the_posts_navigation();

    else :

        get_template_part( 'template-parts/content', 'none' );

    endif; ?>

        </div>
    </div>
</div>