But you can't plug that into the iPhone. Because the phone has lightning port. And the other end of the included cable is USC-C male. And all previous adaptors (the white box that goes on the wall) are USA-A. So yeah... no cookie.
The Macbook charger has a brick with a female USB-C end, and a male-to-male USB-C cable. Which you can unplug from the brick and plug in the USB-C-to-lightning cable, in theory.
Now if you need to charge both, and you have the one-port Macbook, you're SOL. If not, you can plug the phone into the laptop...
Well, I do hope the proposal to buy a Macbook so you can charge your phone was tongue-in-cheek. Because that's a pretty daft solution compared to buying https://www.apple.com/shop/product/MHJA3AM/A/20w-usb-c-power... for $19 if one doesn't have an existing USB-C brick.
