The problem BVG, get me a ride! solves

• A ticket cannot be faked
• The ticket is fully available 24/7 on the ethereum blockchain

Challenges I ran into

I'm new to solidity and this is the first contract that I've ever written.
Writable functions re-entrancy, needed to create a modifier to be used as a locked or mutex.
Computing the expiry date took me a while to figure it out
Deployment of the contract to testnet, I contacted the mentor and receives useful insights and managed to successfully deploy to görli testnet.