calling sub in access vba

I have some code that works but is cumbersome to use.

with z as a variant I made calls like this:

z = Decode("Abi", "polo")
z = Decode("Abi", "xc70")
z = Decode("Abi", "208")

It would pass the values and do its job.

I didnt want to hand write every call so now I have a table of clients and a table of vehicles "to do"

I wrote this to create the string based on vehicles that need doing:

Public Function MakeStrCall(Str1 As String, Str2 As String, intType As Integer, Optional Str3 As String) As String
Dim StrOut As String
Dim DecodeStrFront As String

Dim StrEnd As String

Dim CleanStrFront As String
Dim StrComma As String



StrComma = ","
StrEnd = ")"

If intType = 1 Then
    CleanStrFront = "BtnPrepareData_Click("
    
    
    StrOut = CleanStrFront & Str1 & StrComma & Str2 & StrComma & Str3 & StrEnd

Else

    DecodeStrFront = "Decode('"
    StrOut = DecodeStrFront & Str1 & "'" & StrComma & "'" & Str2 & "'" & StrEnd
End If




MakeStrCall = StrOut

End Function
Private Sub CmdDecode_Click()
Dim Db As DAO.Database
Set Db = CurrentDb()
Dim rstRangetoProcess As DAO.Recordset


Dim strSQL As String
DoCmd.SetWarnings False
Dim z As Variant

strSQL = "SELECT TblClients.ClientName, TblWishlist.RangeToProcess, TblWishlist.Marque" _
& " FROM TblClients, TblWishlist" _
& " GROUP BY TblClients.ClientName, TblWishlist.RangeToProcess, TblWishlist.Marque;"


Set rstRangetoProcess = Db.OpenRecordset(strSQL)
Dim StrFunctionString As String

With rstRangetoProcess

    .MoveFirst
    countRecords = .RecordCount

    'cycle through the recordset
    Do Until rstRangetoProcess.EOF
    
        StrFunctionString = MakeStrCall(.Fields("ClientName").Value, .Fields("RangeToProcess").Value, 2)
       z = StrFunctionString
     Debug.Print z
    
    rstRangetoProcess.MoveNext

    Loop
End With



'old way
'z = Decode("Abi", "polo")
'z = Decode("Abi", "xc70")
'z = Decode("Abi", "208")

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an example of its output: Decode('Abi','208')

if i now do
 z = StrFunctionString  it doesnt work anymore, so would like advice on how to achieve.