protocol Reusable: class {
    static func reuseIdentifier(_ addOn: String?) -> String
}

extension Reusable {
    static func reuseIdentifier(_ addOn: String? = nil) -> String {
        if let addOn = addOn {
            return "\(String(describing: self))-\(addOn)"
        }

        return String(describing: self)
    }
}

extension UICollectionViewCell: Reusable {}
extension UITableViewCell: Reusable {}
extension UITableViewHeaderFooterView: Reusable {}