 
 class Dog {
     
-    static let dogYearsMultiplier = 7
+    static let humanYearsMultiplier = 7
     
     var breed: String
     var color: String

var fido: Dog? = Dog(breed: "Greyhound", color: "fawn", age: 6, name: "Fido")
print("\(fido!.description)")

print("\(fido!.name) is \(fido!.dogYears) in dog years.")

fido!.barking(loudness: Loudness.Soft)
fido!.eating(what: "dog food")

        return "\(name) is a \(age) year old \(color) \(breed)."
    }

    var humanYears: Int {
        
        return age * Dog.humanYearsMultiplier
    }
    
    init(breed: String, color: String, age: Int, name: String) {
