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iOS Object-Oriented Swift Class Inheritance Overriding Methods

Where is my problem? I think its in one of my override functions; but can't figure out where. Any suggestions?

creating Subclasses

objects.swift
class Person {
  var firstName: String
  var lastName: String 

  init(firstName: String, lastName: String) {
    self.firstName = firstName
    self.lastName = lastName
  }

  func fullName() -> String {
    return "\(firstName) \(lastName)"
  }
}

// Enter your code below
class Doctor: Person {
override init(firstName: String, lastName: String) {
    self.firstName = firstName
    self.lastName = lastName
    }
override func fullName() -> String {
return "\("Dr.") \(lastName)"
    }
}

let someDoctor = Doctor(firstName:"Sam", lastName: "Alford")