Swift client, url for item with description . . .

swift_client_url_for_item_with_description.txt

// extract the first two characters of an item's id //
let rangeOfHello = Range(start: itemID.startIndex, end: advance(itemID.startIndex, 2))
let prefixItemID = itemID.substringWithRange(rangeOfHello)
        
var url : NSURL?
        
switch prefixItemID
{
case "PT":
    let filePath : String = "http://localhost:8888/api/v1/plumbing_tools/\(itemID).json"
    url = NSURL(string: filePath)
case "CP":
    let filePath : String = "http://localhost:8888/api/v1/copper_pipes_and_fittings/\(itemID).json"
    url = NSURL(string: filePath)
default:
    url = NSURL(string: "")
}
return url;