// Three parameters are repeated in both functions

func login(username: String, password: String, isExpired: Bool) {
    // ...
}

func authenticate(username: String, password: String, isExpired: Bool) {
    // ...
}

// Solution: Group them as a separated type

struct Required {
    let username: String
    let password: String
    let isExpired: Bool
}

func login(required: Required) {
    // ...
}

func authenticate(required: Required) {
    // ...
}