....
Route::group(['middleware'=>'auth'],function(){

    ....

    // master supplier
    Route::get('master/supplier','Supplier_controller@index');
    Route::post('master/supplier','Supplier_controller@store');
    Route::get('master/supplier/{id}','Supplier_controller@edit');
    Route::put('master/supplier/{id}','Supplier_controller@update');
    Route::delete('master/supplier/{id}','Supplier_controller@delete');

});
....