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use std::convert::From;
use std::fmt::{Formatter, Display, Result as FmtResult};
#[derive(Debug)]
pub struct Rot13(Vec<u8>);
impl Rot13 {
fn decode(&self) -> String{
let decoded = (*self.0).into_iter().map(|c| match *c as char {
'A' ..= 'M' | 'a' ..= 'm' => (*c as u8) + 13,
'N' ..= 'Z' | 'n' ..= 'z' => (*c as u8) - 13,
_ => *c
}).collect::<Vec<u8>>();
format!("{}",String::from_utf8_lossy(&decoded)).to_owned()
}
}
impl From<String> for Rot13 {
fn from(rot13_str: String) -> Self {
Self(rot13_str.into_bytes())
}
}
impl From<&str> for Rot13 {
fn from(rot13_str: &str) -> Self {
Rot13::from(rot13_str.to_string())
}
}
impl Display for Rot13 {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
write!(f, "{}", self.decode())
}
}