B4J Code Snippet Generate Hierarchical Table with Multilevel Numbering

I had a list of categories from Amazon which were stored in a csv like this (semicolon separated 25234 entries):

Main Category;Subcat 1;Subcat 2;Subcat 3;Subcat 4;Subcat 5;Subcat 6;Subcat 7;Subcat 8
Appliances
Appliances;Dishwashers
Appliances;Dishwashers;Built-In Dishwashers
Appliances;Dishwashers;Countertop Dishwashers
Appliances;Dishwashers;Portable Dishwashers
Appliances;Laundry Appliances
Appliances;Laundry Appliances;Washers & Dryers

I wanted output like this to create a hierarchical tree:

ParentID; ID; Category
0; 1; Appliances
1; 1.1; Dishwashers
1.1; 1.1.1; Built-In Dishwashers
1.1; 1.1.2; Countertop Dishwashers
1.1; 1.1.3; Portable Dishwashers
1; 1.2; Laundry Appliances
1.2; 1.2.1; Washers & Dryers
1.2.1; 1.2.1.1; Clothes Dryers

You can use the code snippet to convert any similar data to Multilevel Numbering (1.1.1.1 kind of notation).

Please note:
1. It skips first row as header
2. Assigns "0" as parent ID for all top Level items.
3. It supports 10 levels of branches. (It can easily be increased or decreased in code)

Here is the code snippet which does the job:

Spoiler: C

'Non-UI application (console / server application)
#Region Project Attributes
    #CommandLineArgs:
    #MergeLibraries: True
#End Region

Sub Process_Globals

    Dim counters(9) As Int   ' Modify 9 here to change branch levels
    Dim lastCat(9) As String ' Modify 9 here to change branch levels
    Dim outdata As List
    Dim parts() As String
End Sub

Sub AppStart (Args() As String)
    outdata.Initialize
    ProcessCategories
End Sub

Sub ProcessCategories
    Dim inputData As List= File.ReadList(File.DirAssets, "AmazonCategories.txt")   
    Dim t As Long = DateTime.Now
    For z = 1 To inputData.Size-1
        SplitAndProcessString( inputData.Get(z))
    Next

    ' Prepare to save
    Dim cs As StringBuilder
    cs.Initialize
    Log("Total records processed: " & outdata.Size)
    For Each row() As String In outdata
        cs.Append(row(0))
        For i = 1 To row.Length - 1
            cs.Append(";").Append(row(i))
        Next
        cs.Append(CRLF)
    Next

    File.WriteString(File.DirTemp, "output.txt", cs.ToString)
    Log("Total Time taken: " & ((DateTime.Now-t)/1000))
End Sub

Sub FillArray(arrLength As Int)
        Dim tempArr(9) As String  ' Modify this number 9 to increase branches
        For i = 0 To arrLength - 1
            tempArr(i) = parts(i)
        Next
        parts = tempArr
End Sub


private Sub SplitAndProcessString(inputString As String)
    ' Split the input string by semicolon
    parts = Regex.Split(";+", inputString)
    ' Fillempty array
    FillArray(parts.Length)
    ' Loop through the parts and process each one
    For part = 0 To parts.Length - 1
        If lastCat(part) <> parts(part) Then
            If part = 0 Then
                counters(part) = counters(part) + 1
                outdata.add(Array As String("0",counters(part),parts(part)))
                resetRestCounters(part)
                Exit
            Else
                counters(part) = counters(part) + 1
                resetRestCounters(part)
                Dim p As String = getcounter(part-1)
                outdata.add(Array As String(p,p & "." & counters(part),parts(part)))
                Exit
            End If
        End If
    Next
    lastCat = parts
End Sub

Sub resetRestCounters(level As Int)
    For y = level + 1 To counters.Length-1
        counters(y) = 0
    Next
End Sub

Private Sub getcounter(level As Int) As String
    If level < 0 Then Return counters(0)
    Dim sb As String
    For i = 0 To level
        sb= sb & (counters(i))
        If i < level Then sb=sb & "."
    Next
    Return sb
End Sub