You are given a square matrix representing an image. Rotate the image by 90 degrees clockwise in-place.

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

Construct the longest possible string using limited quantities of 'a', 'b', and 'c', ensuring that no three consecutive characters are the same. Return the longest string satisfying this constraint.