foobar.swift

protocol A {
    var name: String { get set }
    func foo()
}

protocol B {
    var name: String { get set }
    func foo()
}

extension A {
    func foo() {
        print("Foo")
    }
}

extension B {
    func foo() {
        print("Bar")
    }
}

class C: A, B {
    var name: String = "Foo Bar"
}

let c = C()
c.foo()