links.reduce((acc, n) => {
const path = n.url.split('/');
const [ lastFolder ] = path.splice(-2);
(path.reduce((p, c) => p[c] ??= {}, acc)[lastFolder] ??= []).push(n);
return acc;
}, {})links.reduce((acc, n) => (
n.url
.match(/[^\/]+(?=\/)/g)
.reduce((p, c, i, a) => p[c] ??= (-~i < a.length ? {} : []), acc)
.push(n),
acc
), {})