Challenge

We'll tie together a variety of Swift language techniques, giving you additional practice to create structs, functions, data types, and optionals, and use flow control structures.

To solidify your understanding of basic struct and class usage by practicing the creation of each type of object.

1. Launch Xcode, and create a new playground, then save it to your desktop with the name Activity 5 - Final Activity.playground.

2. Add the following enum, which will be used to classify customers by gold, silver, and platinum levels. Note that this enum has a rawValue of type String, which we will use while printing customer information:

   enum CustomerType:String {
       case silver = "SILVER"
       case gold = "GOLD"
       case platinum = "PLATINUM"
   }

3. Create a new Customer struct with a set of String variables, including an optional for country and the variable type to classify the customer into one of the CustomerType categories:

   struct Customer {
       var name: String
     ...