Small abstraction for url scheme

url.swift

import Foundation

enum LinkType: FormatterUrl {
    case product(String)
    case look(String)

    func formatter(prefix: String) -> String {
        switch self {
            case .product(let id): return prefix.appending("://products/\(id)")
            case .look(let id): return prefix.appending("://looks?order=1&collections=\(id)")
        }
    }
}

protocol FormatterUrl {
    func formatter(prefix: String) -> String
}

extension URL {

    init?(scheme: String, formatter: FormatterUrl ){
        guard let url = URL(string: formatter.formatter(prefix: scheme)) else { return nil }
        self = url
    }
}

let product = URL(scheme: "app", formatter: LinkType.product("1234"))
let look = URL(scheme: "app", formatter: LinkType.look("1234"))