Check license header for project

[wolfstudy]

Signed-off-by: xiaolong.ran rxl@apache.org

Check license header for project

The license header content as follows:

// Licensed to the Apache Software Foundation \(ASF\) under one
// or more contributor license agreements\.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership\.  The ASF licenses this file
// to you under the Apache License, Version 2\.0 \(the
// "License"\); you may not use this file except in compliance
// with the License\.  You may obtain a copy of the License at
//
//   http://www\.apache\.org/licenses/LICENSE-2\.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied\.  See the License for the
// specific language governing permissions and limitations
// under the License