Search using TextFiled in Multi Sectioned TableView - Swift

I did a search with a textbox using the method below and it works great when I use a separate section in a table view.

But I don't know how to achieve this when I have multiple sections in the View table

In a normal single cut tableview

foodTypeArr = ["Japanesh", "Chinesh", "Lebanesh", "Italian", "Indian"]
searchResultArr.addObjects(from: foodTypeArr as! [Any])

func searchAutocompleteEntriesWithSubstring(substring: String)
{
 searchResultArr.removeAllObjects()

        for curString in foodTypeArr
        {
            let myString:NSString! = curString as! NSString

            if (myString).lowercased.contains(substring)
            {
                searchResultArr.add(curString)
            }
        }

        self.tblList.reloadData()
 }

      

        
        
        
      

    

In Multi Section TableView

var searchAreaArr = NSMutableArray()    
var areaArr = [[String]]()
var areaTitles = NSArray()

areaArr = [["Vadvalli", "Mullai Nagar", "P.N.Pudhur"], ["Lawly Road", "Kowly Brown", "D.B Road"], ["Raja Street", "Gandhipark", "Five corner road", "Main Town Hall"]]

areaTitles = ["Vadavalli", "R.S.Puram", "Town Hall"]

for i in 0..<areaArr.count
{
   searchAreaArr.addObjects(from: areaArr[i])
}

      

        
        
        
      

    

I am calling below method on TextField-shouldChangeCharactersIn

func searchAutocompleteEntriesWithSubstring(substring: String)
{
    areaArr.removeAll()
            var mArr = [String]()

        for curString in searchAreaArr
        {
            let myString:NSString! = curString as! NSString

            if (myString).lowercased.contains(substring)
            {
                mArr.append(curString as! String)
            }
        }
        areaArr.insert(mArr, at: 0)
}

      

        
        
        
      

    

with this, it inserts the filtered rows into the 0th Index array in areaArr . But I need it to be on their sections, and the section title should be their own, and change the "Index of Filtered Row Sections"

Say For example, if the search text is expensive , it should be

R.S puram (Section 1)
- Lawly Road
- D.B Road
Town Hall (Section 2)
- Five corner road

      

        
        
        
      

    

My table view methods

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

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    return areaArr[section].count
}

func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String?
{
    if section < areaTitles.count
        {
            return areaTitles[section] as? String
        }
    return nil
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
        let cell:UITableViewCell = 
self.tblList.dequeueReusableCell(withIdentifier: "cell") as UITableViewCell!
    cell.textLabel?.text = "\(areaArr[indexPath.section][indexPath.row])"
}

      

        
        
        
      

    

I lost one day with him, please help fix this .... Your suggestions are welcome