stringByTrimmingWhitespace.swift

private extension String {
    
    func trimWhiteSpace()-> String{
        let removeSpaces = trimCharacters(" ", sourceText: self)
        if removeSpaces.hasSuffix("\n"){
            return String(removeSpaces.characters.dropLast())
        }
        return  removeSpaces
    }
    
    func trimCharacters(charToTrim:Character, sourceText:String) -> String{
        var editCharacterView = sourceText.characters
        var editString = String(editCharacterView)
        
        let trimFirst  = sourceText.characters.first == charToTrim
        let trimLast   = sourceText.characters.last == charToTrim
        
        if trimFirst { editCharacterView  = editCharacterView.dropFirst() }
        if trimLast { editCharacterView  = editCharacterView.dropLast() }
        
        if trimFirst || trimLast == true {
            editString = trimCharacters(charToTrim, sourceText: String(editCharacterView))
        }
        return editString
    }
}