Given an integer array data representing the data, return whether it is a valid UTF-8 encoding.
A character in UTF8 can be from 1 to 4 bytes long, subjected to the following rules:
For a 1-byte character, the first bit is a 0, followed by its Unicode code.
For an n-bytes character, the first n bits are all one’s, the n + 1 bit is 0, followed by n — 1 bytes with the most significant 2 bits being 10.
This is how the UTF-8 encoding would work: