languages_get_protocol_ext.swift

struct Languages {
    
    class Get: Getter {
        
        func getUrl() -> String {
            return "http://some_languages_website.com"
        }
        
        func getDataFrom(dictionary: NSDictionary) -> [Language] {
            return extractLanguagesFrom(dictionary)
        }
        
        private func extractLanguagesFrom(dictionary: NSDictionary) -> [Languages] {
          ...
        }
    }
}