/**
 * Returns the category rewrite slug used for category archives.
 *
 * @since  1.0.0
 * @access public
 * @return string
 */
function ccp_get_category_rewrite_slug()
{
    $portfolio_base = ccp_get_portfolio_rewrite_base();
    $category_base = ccp_get_category_rewrite_base();
    $slug = $category_base ? trailingslashit($portfolio_base) . $category_base : $portfolio_base;
    return apply_filters('ccp_get_category_rewrite_slug', $slug);
}
    /**
     * Portfolio rewrite base field callback.
     *
     * @since  1.0.0
     * @access public
     * @return void
     */
    public function field_category_rewrite_base()
    {
        ?>

		<label>
			<code><?php 
        echo esc_url(home_url(ccp_get_portfolio_rewrite_base() . '/'));
        ?>
</code>
			<input type="text" class="regular-text code" name="ccp_settings[category_rewrite_base]" value="<?php 
        echo esc_attr(ccp_get_category_rewrite_base());
        ?>
" />
		</label>
	<?php 
    }