To determine the width of a UTF-8 character by providing its first byte.
References: https://tools.ietf.org/html/rfc3629
assert_eq!(1, utf8_width::get_width(b'1')); assert_eq!(3, utf8_width::get_width("δΈ".as_bytes()[0]));
cargo bench
https://crates.io/crates/utf8-width