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$validator = Validator::make($request->all(),
                    [
                      'name' => 'required',                    
                      // 'email' => 'nullable|email',
                      'email' => [
                            'nullable',
                            'email',
                            Rule::unique('clients')->where(function ($query) use($id) {
                                return $query->where('id','<>',$id);
                            }),
                        ]                       
                    ]
                );