cusotm equatable

protocol CusotmEquatable {
    func isEqual(to rhs: CusotmEquatable) -> Bool
}

extension CusotmEquatable where Self: Equatable {
    func isEqual(to rhs: CusotmEquatable) -> Bool {
        guard let rhs = rhs as? Self else {
            return false
        }
        return self == rhs
    }
}