pub trait FileLoader {
// Required method
fn load_file<'life0, 'life1, 'async_trait>(
&'life0 self,
file_path: &'life1 str,
) -> Pin<Box<dyn Future<Output = Result<String, Error>> + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait;
}