Strike through String while maintaining String type

String+StrikeThrough.swift

//Doesn't work with all characters - use cautiously. NSAttributedString is preferred.
extension String {
     var strikeThrough: String {
        guard let strikeThrough = "\u{0336}".unicodeScalars.first else {
            return ""
        }
        return self.map { char -> String in
            var c = UnicodeScalarView(char.unicodeScalars)
            c.append(strikeThrough)
            return String(c)
        }.joined()
    }
}