pub struct FreshAudio<'a> {
    url: &'a str,
    title: &'a str,
    performer: Option<&'a str>,
    duration: Option<usize>,
}

pub struct CahcedAudio(String);

#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub struct Audio<'a, C> {
    kind: C,
    caption: Option<&'a str>,
}

impl<'a, FreshAudio> Audio<'a> {
    fn title(title: &'a str) -> {

    }
}