Hello everyone, I feel like i did not understand refactoring. This is what I did for error messages. Is it ok?

import UIKit

class ViewController: UITableViewController {
    var allWords = [String]()
    var usedWords = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(promptForAnswer))

        if let startWordsURL = Bundle.main.url(forResource: "start", withExtension: "txt") {
            if let startWords = try? String(contentsOf: startWordsURL){
                allWords = startWords.components(separatedBy: "\n")
            }
        }

        if allWords.isEmpty {
            allWords = ["Silkworm"]
        }

        startGame()
    }

    func startGame() {
        title = allWords.randomElement()
        usedWords.removeAll(keepingCapacity: true)
        tableView.reloadData()
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return usedWords.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Word", for: indexPath)
        cell.textLabel?.text = usedWords[indexPath.row]
        return cell
    }

    @objc func promptForAnswer() {
        let ac = UIAlertController(title: "Enter Answer", message: nil, preferredStyle: .alert)
        ac.addTextField()

        let submitAction = UIAlertAction(title: "Submit", style: .default) {
            [weak self, weak ac] _ in
            guard let answer = ac?.textFields?[0].text else { return}
            self?.submit(answer)
        }
        ac.addAction(submitAction)
        present(ac, animated: true)
    }

    func submit(_ answer: String) {
        let lowerAnswer = answer.lowercased()

       // let errorTitle: String
      //  let errorMessage: String

        if isPossible(word: lowerAnswer){
            if isOriginal(word: lowerAnswer){
                if isReal(word: lowerAnswer){
                    if isShort(word: lowerAnswer){

                        usedWords.insert(answer, at:0)

                        let indexPath = IndexPath(row: 0 , section: 0)
                        tableView.insertRows(at: [indexPath], with: .automatic)
                        return
                    } else {
                        showErrorMessage(title:  "Word whould be more than 3 letters", message: " too Short Bitch")
                        //errorTitle = "Word whould be more than 3 letters"
                        //errorMessage = " too Short Bitch"
                    }
                }else {
                    showErrorMessage(title:  "word not recognized", message: "you cant just make them up")

                    //errorTitle = "word not recognized"
                    //errorMessage = "you cant just make them up"
                }
            }else{

                showErrorMessage(title:  "Word already used", message: "Be more Original")
               // errorTitle = "Word already used"
               // errorMessage = "Be more Original"
            }
        } else {
            showErrorMessage(title: "Word not possible", message: "You cant spell that word from \(title!.lowercased())")
           // errorTitle = "word not possible"
           // errorMessage = "You cant spell that word from \(title!.lowercased())"
        }
        //let ac = UIAlertController(title: errorTitle, message: errorMessage, preferredStyle: .alert)
        //ac.addAction(UIAlertAction(title: "OK", style: .default))
       // present(ac, animated: true)
    }

    func isPossible(word:String) -> Bool {
        guard var tempWord = title?.lowercased() else { return false }
        for letter in word {
            if let position = tempWord.firstIndex(of: letter) {
                tempWord.remove(at: position)
            }else {
                return false
            }
        }
        return true
    }

    func isOriginal(word: String) -> Bool {
        return !usedWords.contains(word)
    }

    func isReal(word: String) -> Bool {
        let checker = UITextChecker()
        let range = NSRange( location: 0, length: word.utf16.count)
        let misspelledRange = checker.rangeOfMisspelledWord( in: word, range: range, startingAt: 0 , wrap: false, language: "en")
        return misspelledRange.location == NSNotFound
    }

    func isShort(word: String) -> Bool {
        let shortWord = word.count
        if shortWord < 3 {
            return false
        }else{
            return true
        }
    }
    func showErrorMessage(title: String, message: String) {

        let errorTitle = title
        let errorMessage = message

        let ac = UIAlertController(title: errorTitle, message: errorMessage, preferredStyle: .alert)
        ac.addAction(UIAlertAction(title: "OK", style: .default))
        present(ac, animated: true)
    }

}

thank you