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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def step_a_new_working_directory(context):
 """ Creates a new, empty working directory """

    command_util.ensure_context_attribute_exists(context, "workdir", None)
    command_util.ensure_workdir_exists(context)
    shutil.rmtree(context.workdir, ignore_errors=True)