fn truncate_and_increment_utf8(data: &str, length: usize) -> Option<Vec<u8>>Expand description
Truncate a UTF-8 slice and increment it’s final character. The returned value is the
longest such slice that is still a valid UTF-8 string while being less than length
bytes and non-empty. Returns None if no such transformation is possible.
The caller guarantees that data.len() > length.