janakmshah

Car           = Refuelable + Drivable;
Motorbike     = Refuelable + Rideable;
CleanerCar    = Refuelable + Driveable + Cleaner;
MechanicRobot = VehicleFinder + Maintainer;
CleanerRobot  = VehicleFinder + Cleaner;

janakmshah

protocol Refuelable {
  func refuel()
}

protocol Drivable {
  func drive()
}

protocol Rideable {
  func ride()

janakmshah

struct Car: Refuelable, Drivable {}
struct Motorbike: Refuelable, Rideable {}
struct CleanerCar: Refuelable, Drivable, Cleaner {}
struct MechanicRobot: VehicleFinder, Maintainer {}
struct CleanerRobot: VehicleFinder, Cleaner {}

janakmshah

protocol Refuelable {
    func refuel()
}

protocol Drivable {
    func drive()
}

struct Car: Refuelable, Drivable {}