[Swift]StringExtension

func explode(separator: Character) -> [String] {
        let subSequneceArray = self.characters.split { (element: Character) -> Bool in
            return element == separator
        }

        var stringArray: [String]!
        for i in 0 ..< subSequneceArray.count {
            stringArray.append(String(subSequneceArray[i]))
        }
        return stringArray
}