```ruby
# Copyright 2008 Dag Odenhall <dag.odenhall@gmail.com>
#
# Licensed 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.

class String
  def camel_case
    split(/[\s_-]/).map {|t| t[0].chr.upcase + t[1..-1] }.join
  end
end
```

Fix tiny issue with camel_case
user
```ruby
# Copyright 2008 Dag Odenhall <dag.odenhall@gmail.com>
#
# Licensed 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.

class String
  def camel_case
    split(/[\s_-]/).map {|t| t[0].chr.upcase + t[1..-1] unless t.empty? }.join
  end
end
```
assistant