Charge families for a children's holiday camp with duplicate bookings, a 14-day refund window, a weekly cap and sibling discounts

# Charge families for a children's holiday camp Inputs: `children.csv` (child_id, family_id), `bookings.csv` (booking_id, child_id, week_start, days), `cancellations.csv` (booking_id, cancelled_on), `prices.json` and `office-note.txt`. Every amount is in pounds. The files and these rules are the record; where the note disagrees with them, the rules win. Rules: - If a child has more than one booking for the same week_start, only the one with the lowest booking number counts (compare the number after BK-, so BK-98 is lower than BK-102); the others are ignored entirely. - A cancelled booking is refunded in full (not charged) if cancelled_on is 14 or more days before week_start; otherwise it is charged as booked. - Charge per booking = number of days x day_price, but never more than week_price. - Within each family and week, every charged booking except the one with the highest charge gets sibling_discount_pct off, rounded half-up to the penny (on a tie, the lowest child_id pays in full). Write `out/camp.json`: `{"counted": [<sorted booking_ids that are charged>], "refunded": [<sorted booking_ids refunded>], "family_due": {"<family_id>": <amount>, ...}, "grand_total": <sum>}` with every family in `children.csv` in `family_due` (0 where nothing is due). ## 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.