Function Get-DotnetExtraSDKs {
    <#
.SYNOPSIS
    Delete extra runtimes for dotnet. Ensure that we only keep the latest around.
    This assumes that minors are as distinct as majors. Supply the flag RemoveNonMajorDupes to get non-latest minors per major.

.PARAMETER RemoveNonMajorDupes
    Only consider majors as "unique"

.PARAMETER ReturnExpiredSdks
    Returns the out of date SDKs

.EXAMPLE
    Get-DotnetExtraSDKs
#>

    [CmdletBinding()]
    [OutputType([System.Array])]
    param(
        [switch]$RemoveNonMajorDupes,
        [switch]$ReturnExpiredSdks
    )

    $logLead = Get-LogLeadName
    $deleteSdks = @()
    $allSdks = @{}

    $sdks = dotnet --list-sdks
    Write-Host "$logLead : Dotnet SDKs installed on local machine:"
    foreach ($sdk in $sdks) {
        Write-Host "$logLead : $sdk"
        $sdkParentPath = (($sdk -split '\[')[1] -split '\]')[0]
        $sdkApp = "SDK"
        $sdkVersion = [System.Version]($sdk -split ' ')[0]
        $sdkPath = (Join-Path $sdkParentPath $sdkVersion)

        if ($allSdks.Keys -notcontains $sdkApp) {
            Write-Verbose "$logLead : adding version $sdkPath"
            $allSdks[$sdkApp] = @{ Version = [System.Version]$sdkVersion; Path = $sdkPath; };
        }
        if ($allSdks[$sdkApp].Version.Major -lt $sdkVersion.Major) {
        } elseif ($allSdks[$sdkApp].Version.Minor -lt $sdkVersion.Minor -and $RemoveNonMajorDupes) {
            Write-Verbose "$logLead : adding delete sdk $($allSdks[$sdkApp].Path)"
            $deleteSdks += $allSdks[$sdkApp].Path;
        } elseif ($allSdks[$sdkApp].Version.Build -lt $sdkVersion.Build) {
            Write-Verbose "$logLead : adding delete sdk $($allSdks[$sdkApp].Path)"
            $deleteSdks += $allSdks[$sdkApp].Path;
        }
        $allSdks[$sdkApp] = @{ Version = $sdkVersion; Path = $sdkPath; };
    }

    Write-Host "$logLead : Dotnet SDKs that should be deleted/out of date:"
    foreach ($deleteSdk in $deleteSdks) {
        Write-Host "$logLead : $deleteSdk"
    }
    if ($ReturnExpiredSdks) {
        Return $deleteSdks
    }
}