Remove Legacy User groups at Site collection level

Remove Legacy User groups at Site collection level:-
Input :- Two input files (CSV format) are used in this script.
1st input file (Asset.CSV) will have all site collection url listed one below the other.
2nd input file (Group.CSV) will have legacy SharePoint user group names listed one below the other.

Output:-
Legacy groups will be removed with a log generated with same info.

Script Source:-

Add-PSSnapin Microsoft.SharePoint.PowerShell
$global:strLoanListFileName = Read-Host "Enter the location of Asset.csv"
$global:strGroupListFileName = Read-Host "Enter the location of Groups.csv"
$LogPath = Read-Host "Enter a location for log file  :"
$LogFileName = Read-Host "Enter name for log file  :"
$FilePath = $LogPath + "\" + $LogFileName
function write-log([string]$label, [string]$logMsg)
{
    if($logFileCreated -eq $False)
    {
        write-host "Creating log file..."
        if((Test-Path -path $LogPath) -ne $True)
        {
            write-host "Provide proper values to LogPath folder" -ForegroundColor Red
        }
        else
        {
            Add-Content -Path $FilePath -Value $logHeader
            $script:logFileCreated  = $True
            write-host "Log file created..."
        }
    }
    else
    {
        [string]$info = [System.String]::Format("[$Date] {0}: {1}",$label, $logMsg)
        Add-Content -Path $FilePath -Value $info
    }
}


[Microsoft.SharePoint.SPSecurity]::RunWithElevatedPrivileges(
{
                Write-Host "Deletion Process Started...Time - $(get-date -format HH:mm:ss)" -Foregroundcolor Green
                write-log  "Deletion Process Started...Time -" "$(get-date -format HH:mm:ss)"
                $StartTime=Get-Date
             
                Import-CSV -Path $global:strLoanListFileName   | ForEach-Object {
                                if($_.AssetID -ne $null -and $_.AssetID -ne "")
                                {
                                $global:LoanNo=$_.AssetID                              
                                Write-Host $global:LoanNo
                                write-log $global:LoanNo
                                        Import-CSV -Path $global:strGroupListFileName   | ForEach-Object {
                                        if($_.Group -ne $null -and $_.Group -ne "")
                                        {
                                       
                                            $global:Group=$_.Group
                                            write-log "Site Group"
                                            write-log $global:Group                                          
                                            deleteGroup
                                           
                                        }
                                        }                    
                                }
                }
                $StartTime=(Get-Date) - $StartTime
                write-host "Total execution time- " $StartTime
                write-log "Total execution time- " $StartTime
                Write-Host "Deletion Process Completed...Time - $(get-date -format HH:mm:ss)" -Foregroundcolor Green
                write-log "Deletion Process Completed...Time -" "$(get-date -format HH:mm:ss)"
})


function deleteGroup
{
$web = get-SPWeb  $global:LoanNo
$GroupName =$global:Group
$objSiteGroup = $web.SiteGroups["$GroupName"]
if ($objSiteGroup)
{
$web.SiteGroups.Remove(“$GroupName”)
write-log "Group Deleted"
$web.Update()
}
else
{
write-host " Group does not exist.."
write-log " Group does not exist.."
}
$web.Dispose()
}