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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 _prepare_workdir(self):
 """Prepare the location in our task workdir to store all the hardlinks to coursier cache dir."""

    pants_jar_base_dir = os.path.join(self.versioned_workdir, 'cache')
    safe_mkdir(pants_jar_base_dir)
    return pants_jar_base_dir