Prepare a dog walker's monthly owner statements with extra-dog pricing and bank holiday surcharges

# Prepare a dog walker's owner statements for December Inputs: `walks.csv` (each walk: owner, date, type, minutes, dogs) and `rates.json` (the rate per walk for each type and length, and the bank holiday dates). Every amount is in pounds. Pricing rules, per walk: - The walk rate comes from rates.json by type (solo or group) and minutes (30 or 60). - Walk price = the rate for the first dog plus half the rate for each further dog on that walk. - A walk on a date listed in bank_holidays carries a surcharge of 20% of the whole walk price; there is no surcharge on other days, weekends included. - Round each walk's price and each surcharge to the cent half-up before adding anything up. Write `out/statement.json`: `{"base": {"<owner>": <sum of walk prices>, ...}, "surcharge": {...}, "total": {...}, "grand_total": <sum of the totals>}` with every owner in `walks.csv`. ## How this run works - Work on your own: nobody will answer questions in this task, and writing to `ask/` counts against the run. - Write only under `out/`. Create `out/` if it is missing. Inputs are synthetic; don't fetch anything from the network. - Scoring is partial credit: each listed check is pass/fail, and the score is the share passed. Numbers are compared to within 0.005 unless the task says otherwise.