tbd

ps_classes

class HelperStuff
{
   # get first character of string and throw exception
   # when string is empty or multi-line
   static [char] GetFirstCharacter([string]$Text)
   {
      if ($Text.Length -eq 0) { throw 'String is empty' }
      if ($Text.Contains("`n")) { throw 'String contains multiple lines' }
      return $Text[0]
   }
   
   # get file extension in lower case
   static [string] GetFileExtension([string]$Path)
   {
      return [Io.Path]::GetExtension($Path).ToLower()
   }
}

#examples of use
[HelperStuff]::GetFirstCharacter('Tobias')
[HelperStuff]::GetFileExtension('c:\TEST.TxT')
[HelperStuff]::GetFileExtension($profile)