Prompt

Could you please refactor the NestedStruct from the FakeSimpleClass? I'd like it to be its own class called NestedClass.

Please create new files base/strings/nested_struct.h and base/strings/nested_struct.cc for the new NestedClass.

In the new NestedClass, please make the member variables private and create public getter and setter methods for them. Also, please add a constructor to initialize the members.

Next, please update FakeSimpleClass to use this new NestedClass.

Finally, please update the build files and compile the code to ensure that the refactoring was successful.