import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

struct Gist: Decodable {

    // implement Gist struct
    // ...

    let files: [String: GistFile]
    let owner: Owner
}

struct Owner: Decodable {

    // implement Owner struct
    // ...

}

struct GistFile: Decodable {

    // implement GistFile struct
    // ...

}

func load() {

    // load gists data with URLSession.shared.dataTask and print loaded gists info
    // ...

}

load()