Function parse_attribute

fn parse_attribute<F, V, E>(
    attributes: &HashMap<String, String>,
    key: &'static str,
    parse: F,
) -> Result<V, LinuxSecretFieldError>
where
    F: FnOnce(&str) -> Result<V, E>,
    E: Display,

Parse the attribute with the given key, using the given parsing function in the given map.