Laravel update and delete image

if ($request->hasfile('project_nda')) {

if ($SalesClosure->project_nda !="" && File::exists(public_path($SalesClosure->project_nda))) {

unlink(public_path($SalesClosure->project_nda));

}

$file = $request->file('project_nda');

$project_nda = "/uploads/sales_closure/{$file->hashName()}";

$file->move(public_path('/uploads/sales_closure'), $project_nda);

$SalesClosure->project_nda = $project_nda;

}