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iOS Build a Simple iPhone App with Swift 2.0 Getting Started with iOS Development Swift Recap Part 1

Someone please help me out somewhat i think what made is perfect but its not working ???

Help me !!!

struct Tag {
    let name: String

struct Post{
    var title: String
    var author: String
    var tag: Tag
    let firstTag 

    init(title: String, author: String, name: String){

        self.title = title
        self.author = author
        self.tag = Tag(name: name)


    func description() -> String{

        return "\(title) by \(author). Filed under \(tag.name)"


let firstTag = Tag(name: "swift")

let firstPost = Post(title: "iOS Development", author: "Apple", tag: firstTag)  

let postDescription = firstPost.description()