I'm having trouble converting my Swift 3 code to Swift 4. I've managed to translate everything else in the app successfully, but am having trouble with a single line of code:
cleanURL = cleanURL.substring(to: cleanURL.index(before: cleanURL.endIndex))
The error I'm getting is this:
ViewController.swift:62:33: 'substring(to:)' is deprecated: Please use String slicing subscript with a 'partial range upto' operator.