This is a submission for the Hacktoberfest Open-Source AI Challenge Week 3: Slow and Steady .

What I Built

“Earn 7.5% cashback.”

That sounds like a number you can subtract from a hotel bill. Then you read the next sentence: maximum reward $60. Minimum spend $200. Taxes excluded. Cannot be combined with coupon codes.

Now compare it with another hotel offering an instant discount. Which costs less? Which requires less money today? Does either stay put you near the part of town you actually wanted?

A headline rate gives you homework.

I built TripStack , a hotel-cost comparison prototype that uses local Gemma to help turn promotional terms into conditions you can inspect, then passes those conditions to a deterministic pricing engine.

The interface separates upfront payment , estimated cashback , and estimated net cost .…