Nested Function

Function Append-LevDistance
{
    [CmdletBinding()]
    Param
    (
        [Parameter(Mandatory=$true, Position=2)]
        [Object] 
        [ref]$Users,

        [Parameter(Mandatory=$true, Position=0)]
        [String]
        $FirstName,

        [Parameter(Mandatory=$true, Position=1)]
        [Object]
        $LastName
    )

    Function Set-Distance ([int]$distance1, [int]$distance2)
    {
        if ($distance1 -gt ($SearchName.Length/2)-AND $distance2 -gt ($SearchName.Length/2))
        { 
            $Users.Remove($User)
        }
        elseif($distance1 -le $distance2)
        { 
            $Users[$Users.IndexOf($User)].LevDistance = $distance1
        }
        else 
        {
            $Users[$Users.IndexOf($User)].LevDistance = $distance2
        }
    }

    $SearchName = $FirstName + $LastName

    if (($FirstName -eq "") -OR ($LastName -eq ""))
    { 
        foreach ($User in $Users.ToArray())
        {                                                                                 
            $distance1 = Get-LevDistance $SearchName $User.GivenName     
            $distance2 = Get-LevDistance $SearchName $User.SurName

            Set-Distance $distance1 $distance2
        }
    }                                                            
    else                                                         
    {
        foreach ($User in $Users.ToArray())
        {                                                            
            $ADName1 = $Users[$i].GivenName + $Users[$i].Surname     
            $ADName2 = $Users[$i].SurName + $Users[$i].Givenname     
            $distance1 = Get-LevDistance $ADName1 $SearchName        
            $distance2 = Get-LevDistance $ADName2 $SearchName

            Set-Distance $distance1 $distance2
        }                                                                           
    } 
}