         }
         
         for i in 0..<words.count {
-            let wordLen = words[i].characters.count
+            let wordLen = words[i].count
         
             if count + (i - last) + wordLen > maxWidth {
                 var spaceNum = 0

            }
        }
        
        for _ in res.characters.count..<lineLength {
            res += " "
        }
        

        return res
    }
    
    fileprivate func buildSpecialLine(_ words: [String], _ start: Int, _ end: Int, _ lineLength: Int) -> String {
        var res = ""
        
        for i in start...end {
