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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 remove_files():
 """ Removes any pre-existing tracks that were not just downloaded """

    logger.info("Removing local track files that were not downloaded...")
    files = [f for f in os.listdir('.') if os.path.isfile(f)]
    for f in files:
        if f not in fileToKeep:
            os.remove(f)