```ruby
# frozen_string_literal: true

#
# Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
# license agreements.  See the NOTICE file distributed with this work for
# additional information regarding copyright ownership.  Crate 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.
#
# However, if you have executed another commercial license agreement
# with Crate these terms will supersede the license and you may use the
# software solely pursuant to the terms of the relevant commercial agreement.

require 'crate_ruby/version'
require 'crate_ruby/error'
require 'crate_ruby/result_set'
require 'crate_ruby/client'

include CrateRuby

module CrateRuby
  def self.logger
    @logger ||= begin
      require 'logger'
      log = Logger.new($stderr)
      log.level = Logger::INFO
      log
    end
  end

  def self.logger=(logger)
    @logger = logger
  end
end
```

Improve the module definition to get rid of the extra include
user
```ruby
# frozen_string_literal: true

#
# Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
# license agreements.  See the NOTICE file distributed with this work for
# additional information regarding copyright ownership.  Crate 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.
#
# However, if you have executed another commercial license agreement
# with Crate these terms will supersede the license and you may use the
# software solely pursuant to the terms of the relevant commercial agreement.

module CrateRuby
  require 'crate_ruby/version'
  require 'crate_ruby/error'
  require 'crate_ruby/result_set'
  require 'crate_ruby/client'

  def self.logger
    @logger ||= begin
      require 'logger'
      log = Logger.new($stderr)
      log.level = Logger::INFO
      log
    end
  end

  def self.logger=(logger)
    @logger = logger
  end
end
```
assistant