durable-objects example returns 500 for list IDs that contain "add" #108

The durable-objects example routes requests with substring checks in src/entry.py:

if "/add" in url.path:
    message = url.path.split("/")[3]
    ...
elif "/show" in url.path:

Any list ID that starts with add matches the first branch, so a show request is handled as an add request and fails with IndexError.

Steps to reproduce

1. cd durable-objects
2. uv run pywrangler dev
3. curl -i http://localhost:8787/address-book/show

Expected result

HTTP 200 with No messages.

Actual result

HTTP 500. The Worker raises IndexError: list index out of range at url.path.split("/")[3]. GET /room-1/add without a message fails the same way.