Build a File-Backed Key-Value Store

Implement a persistent key-value store that supports the following operations for string keys and string values: - `put(key, value)` - `get(key)` - `delete(key)` ### Part 1 Keep data in memory during execution, but support persistence to disk with: - `serialize()` to write the current state to a single file - `deserialize()` to rebuild the store from that file after restart You may choose any reasonable on-disk format, as long as the data can be written and loaded correctly. ### Part 2 Now assume each file on disk has a maximum size limit. Extend the store so persistence is spread across multiple files: - when the current file reaches the size limit, continue writing to a new file - on startup, reconstruct the latest key-value state from all files ### Follow-up - How would you handle concurrent readers and writers safely? - What changes would you make to avoid corruption during crashes? - Write a few basic test cases for normal operations and recovery from disk.