Method new

1472-design-browser-history.rs:8–13

(homepage: String)

impl BrowserHistory {

    fn new(homepage: String) -> Self {
        BrowserHistory {
            his: vec![homepage.clone()],
            idx: 0
        }
    }

    fn visit(&mut self, url: String) {
        self.his.truncate(self.idx + 1);