Join Part PowerShell Function

function Join-Part
{
    <#
    .SYNOPSIS
        Join strings with a specified separator.

    .DESCRIPTION
        Join strings with a specified separator.

        This strips out null values and any duplicate separator characters.

        See examples for clarification.

    .PARAMETER Separator
        Separator to join with

    .PARAMETER Parts
        Strings to join

    .EXAMPLE
        Join-Part -Separator "/" this //should $Null /work/ /well

        # Output: this/should/work/well

    .EXAMPLE
        Join-Part -Parts http://this.com, should, /work/, /wel

        # Output: http://this.com/should/work/wel

    .EXAMPLE
        Join-Part -Separator "?" this ?should work ???well

        # Output: this?should?work?well

    .EXAMPLE

        $CouldBeOneOrMore = @( "JustOne" )
        Join-Part -Separator ? -Parts CouldBeOneOrMore

        # Output JustOne

        # If you have an arbitrary count of parts coming in,
        # Unnecessary separators will not be added

    .NOTES
        Credit to Rob C. and Michael S. from this post:
        http://stackoverflow.com/questions/9593535/best-way-to-join-parts-with-a-separator-in-powershell
    #>
    [CmdletBinding()]
    param
    (
        [Parameter()]
        [String]
        $Separator = '/',

        [Parameter(ValueFromRemainingArguments = $true)]
        [String[]]
        $Parts = $null
    )

    ($Parts | Where-Object { $_ } | ForEach-Object { ([String]$_).Trim($Separator) } | Where-Object { $_ }) -join $Separator
}