how do i charge MacBook pro in my car?

Hi,

You'll need a power inverter such as this: Kensington Auto/Air Power Inverter with USB Ports - Apple

Apple sell an appropriate charger ... and you could probably find others too,

https://www.apple.com/uk/shop/product/HJ3H2ZM/A/belkin-car-charger-24a-12w

you need a car outlet charger. they can be bought on-line or at electronic or auto parts stores. Their compatibility is entirely up to the claims made by the manufacturers.

That is not going to provide adequate wattage to charge a laptop. It's for iPads and iPhones.

You're welcome. 🙂