UISearchBar of an string within an array

I am trying to create a dictionary type app with section header, title text, and subtitle text. I managed to get everything to work using the following code. The only thing I can't figure out is how to filter the UISearchBar to show the results of the String [Coptic] within the array. Is this even possible the way I organized everything or do I need to restructure? Does anyone have any suggestions?

I left the code for the updateSearchResults blank on the bottom because I don't know what to code.

 class Gamma: UITableViewController, UISearchBarDelegate, UISearchResultsUpdating {


    struct words {

        var sectionName : String!
        var coptic : [String]!
        var english : [String]!
    }

    var array = [words]()
    var filtered = [words]()
    var filtered2 = UITableViewController()

    var indexarray = ["Ga", "Ge", "Gy", "Gn", "Go", "Gr", "Gw"]

    let searchController = UISearchController(searchResultsController: nil)




    override func viewDidLoad() {
        super.viewDidLoad()


        let defaultTextAttribs = [NSAttributedStringKey.font.rawValue: UIFont(name:"CS Avva Shenouda", size:17), NSAttributedStringKey.foregroundColor.rawValue:UIColor.black]


        UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = defaultTextAttribs as Any as! [String : Any]


        self.navigationController?.navigationBar.tintColor = UIColor.white

        filtered = array

        searchController.searchResultsUpdater = self
        searchController.hidesNavigationBarDuringPresentation = false
        searchController.dimsBackgroundDuringPresentation = false


        self.navigationItem.titleView = searchController.searchBar

        tableView.rowHeight = UITableViewAutomaticDimension
        tableView.estimatedRowHeight = 400
        tableView.sectionHeaderHeight = 40
        tableView.sectionIndexBackgroundColor = UIColor.clear
        tableView.sectionIndexMinimumDisplayRowCount = 15


        array = [words(sectionName: "Ga", coptic: ["Gabriyl", "gaza", "gazovulakion", "gala", "galynyc", "Galile`a", "galileoc", "gamoc", "gar"], english: ["ghabriyēl\n\n(Heb.) - Gabriel", "ghå`zå\n\n(f.) - Treasure, money chest", "ghåzo`filåk`yon\n\n(Gk.) - Treasury", "ghå`lå\n\n(Gk. m.) - Milk", "ghålēnēs\n\n(Gk. f.) - Gentle, calm", "ghålilā`å\n\nGalilee", "ghålilā`os\n\n(adj.) - Galilean", "ghåmos / gåmos\n\n(Gk. m.) - Wedding, marriage", "ghår\n\n(Gk. conj.) - For, because"]),
        words(sectionName: "Ge", coptic: ["geenna", "gene`a", "genecic", "genneoc", "gennyma", "gennycic", "gennytyc", "gennytria", "genoc", "Gewrgioc"], english: ["ge`ā`nå\n\n(Heb.) - Gehenna, Hades", "gene`å\n\n1. (Gk. f.) - Generation\n\n2. (Gk. f.) - New, recent", "genesis\n\n(Gk. f.) - Birth, start, inception", "gennā`os\n\n(Gk. adj.) - Brave, noble, honorable, good", "gennē`må\n\n(Gk. m.) - Offspring, product", "gennē`sis\n\n(Gk. f.) - Birth, generation", "gennē`tēs\n\n(Gk. m.) - Parent, generator", "gennēt`riyā\n\n(Gk. f.) - Parent, generator", "gā`nos\n\n(Gk. m.) - Race, tribe", "ge`ōrgi`yos\n\nGeorge"]),
                 words(sectionName: "Gy", coptic: ["gy"], english: ["gē\n\n(Gk. f.) - Earth, ground, land"]),
                 words(sectionName: "Gn", coptic: ["gnovoc", "gnwmy", "gnwcic"], english: ["ghno`fos\n\n(Gk. m.) - Darkness, gloom", "ghnō`mē\n\n(Gk. f.) - Opinion, thought, judgement", "ghnō`sis\n\n(Gk. f.) - Knowledge"]),
                 words(sectionName: "Go", coptic: ["Golgo;a", "Gomorra", "gonato"], english: ["gholghothå\n\n(Heb. f.) - Calvary, Golgotha", "ghomorrå\n\n(Heb.) - Gomorrah", "ghonå`to\n\n(Gk.) - Knee"]),
                 words(sectionName: "Gr", coptic: ["grammateuc", "grammatiky", "gravy"], english: ["gråmmå`tevs\n\n(Gk. m.) - Scribe, secretary", "gråmmå`tikē\n\n(Gk. f.) - Grammar", "ghrå`fē\n\n(Gk. f.) - Writing, drawing, book"]),
                 words(sectionName: "Gw", coptic: ["Gwg"], english: ["gōg\n\nGog"]),

        ]


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as UITableViewCell!

        cell?.textLabel?.text = array[indexPath.section].coptic[indexPath.row]
        cell?.detailTextLabel?.text = array[indexPath.section].english[indexPath.row]
        cell?.textLabel?.font = UIFont(name:"CS Avva Shenouda", size:30)
        cell?.detailTextLabel?.font = UIFont(name: "Constantia", size:25)
        cell?.textLabel?.numberOfLines = 0
        cell?.detailTextLabel?.numberOfLines = 0
        cell?.textLabel?.textColor = UIColor.black
        cell?.detailTextLabel?.textColor = UIColor.darkGray

        return cell!
    }


    override func numberOfSections(in tableView: UITableView) -> Int {
        return array.count
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
       return array[section].coptic.count

    }

    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return array[section].sectionName

    }

    override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
        return indexarray
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

    override func tableView(_ tableView: UITableView, willDisplayHeaderView view: UIView, forSection section: Int)
    {
        let header = view as! UITableViewHeaderFooterView
        header.textLabel?.font = UIFont(name: "CS Avva Shenouda", size: 25)!
        header.textLabel?.textColor = UIColor.black
        header.backgroundView?.backgroundColor = UIColor.lightGray

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("Row \(indexPath.row) selected")
    }

    func updateSearchResults(for searchController: UISearchController) {
        if searchController.searchBar.text! == "" {


        } else {


        }

    }


}

I try to figure out your problem hope you want the following code to get output

//
//  ViewController.swift
//  Testing
//
//  Created by Jaydeep on 28/10/17.


    import UIKit

    class Gamma: UITableViewController, UISearchBarDelegate, UISearchResultsUpdating,UISearchControllerDelegate {


        struct words {

            var coptic : [String]!
            var english : [String]!
        }

        var array = [words]()
        var filtered = [words]()
        var filtered2 = UITableViewController()



        let searchController = UISearchController(searchResultsController: nil)




        override func viewDidLoad() {
            super.viewDidLoad()


            let defaultTextAttribs = [NSAttributedStringKey.font.rawValue: UIFont.systemFont(ofSize: 17), NSAttributedStringKey.foregroundColor.rawValue:UIColor.black]


            UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = defaultTextAttribs as Any as! [String : Any]


            self.navigationController?.navigationBar.tintColor = UIColor.white


            searchController.searchBar.delegate = self
            searchController.searchResultsUpdater = self
            searchController.hidesNavigationBarDuringPresentation = false
            searchController.dimsBackgroundDuringPresentation = false
            searchController.delegate = self

            self.navigationItem.titleView = searchController.searchBar

            tableView.rowHeight = UITableViewAutomaticDimension
            tableView.estimatedRowHeight = 400
            tableView.sectionHeaderHeight = 40
            tableView.sectionIndexBackgroundColor = UIColor.clear
            tableView.sectionIndexMinimumDisplayRowCount = 15


            array = [words(coptic: ["Gabriyl", "gaza", "gazovulakion", "gala", "galynyc", "Galile`a", "galileoc", "gamoc", "gar"], english:
                ["ghabriyēl \n\n(Heb.) - Gabriel", "ghå`zå\n\n(f.) - Treasure,money chest", "ghåzo`filåk`yon\n\n(Gk.) - Treasury", "ghå`lå\n\n(Gk. m.) - Milk", "ghålēnēs\n\n(Gk. f.) - Gentle, calm", "ghålilā`å\n\nGalilee", "ghålilā`os\n\n(adj.) - Galilean", "ghåmos / gåmos\n\n(Gk. m.) - Wedding, marriage", "ghår\n\n(Gk. conj.) - For, because"]),
                     words(coptic: ["geenna", "gene`a", "genecic", "genneoc", "gennyma", "gennycic", "gennytyc", "gennytria", "genoc", "Gewrgioc"], english: ["ge`ā`nå\n\n(Heb.) - Gehenna, Hades", "gene`å\n\n1. (Gk. f.) - Generation\n\n2. (Gk. f.) - New, recent", "genesis\n\n(Gk. f.) - Birth, start, inception", "gennā`os\n\n(Gk. adj.) - Brave, noble, honorable, good", "gennē`må\n\n(Gk. m.) - Offspring, product", "gennē`sis\n\n(Gk. f.) - Birth, generation", "gennē`tēs\n\n(Gk. m.) - Parent, generator", "gennēt`riyā\n\n(Gk. f.) - Parent, generator", "gā`nos\n\n(Gk. m.) - Race, tribe", "ge`ōrgi`yos\n\nGeorge"]),
                     words( coptic: ["gy"], english: ["gē\n\n(Gk. f.) - Earth, ground, land"]),
                     words(coptic: ["gnovoc", "gnwmy", "gnwcic"], english: ["ghno`fos\n\n(Gk. m.) - Darkness, gloom", "ghnō`mē\n\n(Gk. f.) - Opinion, thought, judgement", "ghnō`sis\n\n(Gk. f.) - Knowledge"]),
                     words(coptic: ["Golgo;a", "Gomorra", "gonato"], english: ["gholghothå\n\n(Heb. f.) - Calvary, Golgotha", "ghomorrå\n\n(Heb.) - Gomorrah", "ghonå`to\n\n(Gk.) - Knee"]),
                     words( coptic: ["grammateuc", "grammatiky", "gravy"], english: ["gråmmå`tevs\n\n(Gk. m.) - Scribe, secretary", "gråmmå`tikē\n\n(Gk. f.) - Grammar", "ghrå`fē\n\n(Gk. f.) - Writing, drawing, book"]),
                     words( coptic: ["Gwg"], english: ["gōg\n\nGog"]),

            ]
            filtered = array


        }
        func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
            searchBar.text = ""
            // Hide the cancel button
            searchBar.showsCancelButton = false
            filtered = array
            tableView.reloadData()
        }
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }

        // MARK: - Table view data source
    override func numberOfSections(in tableView: UITableView) -> Int {
    if filtered.count > 0

    {
        return filtered.count
    }
    else
    {
        return 0
    }
}
        override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cellIdentifier = "cell"
            var cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)
            if cell == nil
            {
                cell = UITableViewCell(style: UITableViewCellStyle.value2, reuseIdentifier: cellIdentifier)
            }
            cell?.textLabel?.text = filtered[indexPath.section].coptic[indexPath.row]
            cell?.detailTextLabel?.text = filtered[indexPath.section].english[indexPath.row]
            cell?.textLabel?.font = UIFont.systemFont(ofSize: 20)
            cell?.detailTextLabel?.font = UIFont.systemFont(ofSize: 15)
            cell?.textLabel?.numberOfLines = 0
            cell?.detailTextLabel?.numberOfLines = 0
            cell?.textLabel?.textColor = UIColor.black
            cell?.detailTextLabel?.textColor = UIColor.darkGray

            return cell!
        }

        override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
            return UITableViewAutomaticDimension
        }


        override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

            if filtered.count > 0
            {
                return filtered[section].coptic.count
            }
            else
            {
            return 0
            }
        }

        override var preferredStatusBarStyle: UIStatusBarStyle {
            return .lightContent
        }

        override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            print("Row \(indexPath.row) selected")
        }

        func updateSearchResults(for searchController: UISearchController) {
            // If we haven't typed anything into the search bar then do not filter the results
            if searchController.searchBar.text! == ""
            {
                filtered = array
            }
            else
            {
                filtered.removeAll()
                for  i:Int in 0 ..< array.count
                    {
                        var copticArray:[String] = []
                        var englishArray:[String] = []
                        var tempWord:words = words.init(coptic: [], english: [])


                        let copticCount = array[i].coptic.count
                        for  copticIndex:Int in 0 ..< copticCount
                        {
                            if array[i].coptic[copticIndex].lowercased().contains(searchController.searchBar.text!.lowercased())
                            {

                                copticArray.append(array[i].coptic[copticIndex])
                                englishArray.append(array[i].english[copticIndex])

                            }
                        }

                        tempWord.coptic = copticArray
                        tempWord.english = englishArray
                        if (copticArray.count > 0)
                        {
                            self.filtered.append(tempWord)
                        }
                    }
                tableView.reloadData()

            }
        }


    }