Chunk a List of Lists

You are given a data stream delivered as a list of integer chunks in data. Treat every inner list as one uninterrupted sequence, preserving the original order: read the first inner list left to right, then the second, and so on until every value has been consumed. Your task is to return the stream partitioned into consecutive buffers of size k. Each buffer must hold exactly k elements whenever possible. If the stream finishes with fewer than k values remaining, return a…