UTF-8 Validation

Given an integer array data representing the data, return whether it is a valid UTF-8 encoding (i.e. it translates to a sequence of valid UTF-8 encoded characters).

A character in UTF-8 can be from 1 to 4 bytes long, subject to the following rules:

• For a 1-byte character, the first bit is a 0, followed by its Unicode code.
• For an n-byte character, the first n bits are all 1, 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 works:

Number of Bytes | UTF-8 Octet Sequence (binary)

• 1 byte: 0xxxxxxx
• 2 bytes: 110xxxxx 10xxxxxx
• 3 bytes: 1110xxxx 10xxxxxx 10xxxxxx
• 4 bytes: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

x denotes a bit in the binary form of a byte that may be either 0 or 1.

Note: The input is an array of integers. Only the least significant 8 bits of each integer is used to store the data. This means each integer represents only 1 byte of data.