Function encode 

pub fn encode<I: AsRef<str>>(ref_input: I, add_xn: bool) -> CDnsResult<String>

Encode a string as punycode. The result string will contain only ASCII characters. The result string does not start with xn--.

Example

assert_eq!(
    punycode::encode("académie-française").unwrap(),
    "acadmie-franaise-npb1a"
);