function Get-LastBuiltVersion {
  [CmdletBinding()]
  param(
    [Parameter(Mandatory = $true)]
    [string]$StateFilePath
  )

  if (-not (Test-Path -LiteralPath $StateFilePath)) {
    return $null
  }

  $content = Get-Content -LiteralPath $StateFilePath -Raw -ErrorAction Stop
  if ([string]::IsNullOrWhiteSpace($content)) {
    return $null
  }

  return $content.Trim()
}