Imports System
Imports System.Linq
Class Program
Public Shared Sub Main()
Dim word1 As String = "forest"
Dim word2 As String = "tor"
Dim result As String = New String(word1.Where(Function(ch) Not word2.Contains(ch)).ToArray())
Console.WriteLine($"Result: {result}")
End Sub
End Class
' run:
'
' Result: fes
'