Change WordPress default search URL

wp-custom-search-url.php

<?php
/*
 * Modify Default Search URL
 * old url: domain.com?s=[search_term]
 * new url: domain.com/search/[search_term]
 */
function dctit_change_search_url() {
    if ( is_search() && ! empty( $_GET['s'] ) ) {
        wp_redirect( home_url( "/search/" ) . urlencode( get_query_var( 's' ) ) );
        exit();
    }   
}
add_action( 'template_redirect', 'dctit_change_search_url' );