public/Join-URL.ps1

function Join-Url {
    <#
    .SYNOPSIS
        Join-Path for WEB URL strings
    .DESCRIPTION
        Join-Path for WEB URL strings
    .PARAMETER Path
        Base path string
    .PARAMETER ChildPath
        Child path string to append to Path
    .EXAMPLE
        Join-Url -Path "https://www.contoso.com" -ChildPath "sales"
        returns "https://www.contoso.com/sales"
    .EXAMPLE
        Join-Url -Path "https://www.contoso.com/sales/" -ChildPath "accounts"
        returns "https://www.contoso.com/sales/accounts"
    .LINK
        https://github.com/Skatterbrainz/helium/blob/master/docs/Join-Url.md
    #>

    param (
        [parameter(Mandatory,Position=0)][ValidateNotNullOrEmpty()][string] $Path, 
        [parameter(Mandatory,Position=1)][ValidateNotNullOrEmpty()][string] $ChildPath
    )
    if ($Path.EndsWith('/')) {
        Write-Output "$Path$ChildPath"
    }
    else {
        Write-Output "$Path/$ChildPath"
    }
}