code: def create_examples_all():
      
      remove_examples_all()
      examples_all_dir().mkdir()
  
      for lib in libraries():
          maindir = examples_all_dir() / lib.upper()[0:1] / lib
  #        libraries_dir() /
          maindir.makedirs_p()
  
          for ex in lib_examples(lib):
              d = lib_example_dir(lib, ex)
              if hasattr(os, 'symlink'):
                  d.symlink(maindir / ex)
              else:
                  d.copytree(maindir / ex)
docs: create arduino/examples/all directory.
  
      :rtype: None