Multi USB C Cable

Just bear in mind this is the sort of thing you don't want to buy too cheaply.

The little boxes on the proper ones are USB hubs, they just have the cables attached permanently instead of sockets to save space.

But the cheap ones will just wire all the cables directly together. This won't work for a lot of uses (e.g. most things involving data transfer). It's not part of the USB spec and while many devices are tolerant of badly behaving cables murphy's law says there's a good chance you'll plug it into the one that isn't.