Protocols in Swift 3. Task 1 and 2 a bit confusing

Hi there. Please I've already tried these tasks many times but it is not working. With playground everything is fine. When I try to use the "_" to omit the external argument label it does not work anymore, both tasks.

Any suggestions? Tks in advance.

In the editor below, I've declared a class, WifiLamp, that represents an interface to one of those Internet of Things lamps. The class models state that determines whether the lamp is on or off and a color, represented by the Color enum. For the first step, declare a protocol named ColorSwitchable. The protocol has a single requirement: a method named switchColor that takes a value of Color as an argument. For the sake of this challenge, make sure your external argument label is omitted by using an underscore. Give the argument a local name of color.

// task 1 protocol ColorSwitchable { func switchColor(color: Color) }

//task 1

enum LightState { case On, Off }

enum Color { case RGB(Double, Double, Double, Double) case HSB(Double, Double, Double, Double) }

//task2 - WifiLamp using the protocol class WifiLamp: ColorSwitchable { let state: LightState var color: Color

init() {
    self.state = .On
    self.color = .RGB(0,0,0,0)
}
//task 2
func switchColor(color: Color) {
    self.color = color
}

//task 2
}

protocol ColorSwitchable {
    func switchColor(color: Color)
}

enum LightState {
    case On, Off
}

enum Color {
    case RGB(Double, Double, Double, Double)
    case HSB(Double, Double, Double, Double)
}

class WifiLamp: ColorSwitchable {
    let state: LightState
    var color: Color

    init() {
        self.state = .On
        self.color = .RGB(0,0,0,0)
    }



}