pub trait FieldCounter {
// Required methods
fn add_to_counter(&self, map: &mut HashMap<String, usize>);
fn remove_from_counter(&self, map: &mut HashMap<String, usize>);
}
pub trait FieldCounter {
// Required methods
fn add_to_counter(&self, map: &mut HashMap<String, usize>);
fn remove_from_counter(&self, map: &mut HashMap<String, usize>);
}