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import Foundation // Protocol for greeting protocol Greeter { func greet() -> String } // User struct conforming to Greeter protocol struct User: Greeter { let name: String let age: Int func greet() -> String { return "Hello, my name is \(name) and I am \(age) years old." } func isAdult() -> Bool { return age >= 18 } } // Extension to add additional functionality extension User { func birthYear(currentYear: Int) -> Int { return currentYear - age } }