void (() => {
    'use strict';
    const ASIN = (location.pathname + '/').match(/\/[0-9A-Z]{10}\//)[0].slice(1, -1);
    const pureURL = 'https://www.amazon.co.jp/dp/' + ASIN;
    if (location.href !== pureURL) location.assign(pureURL);
})();
