Encode and Decode Strings

Design an algorithm to encode a **list of strings** into a single string. The encoded string is then sent over the network and is decoded back to the original list of strings. Implement a class `Codec` with two methods: - `encode(strs)` — takes a list (array) of strings and returns a single encoded string. - `decode(s)` — takes the encoded string and returns the original list (array) of strings. The machine handling `decode` does not know the original strings, so your encoding must be self-describing. Strings may contain **any** characters, including digits, spaces, and your delimiter, so a naive `join('/')` will not work. Your `decode(encode(strs))` must equal `strs` for every possible input.