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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 get_fn(name):
 """Get the full path to one of the reference files shipped for utils. In the source distribution, these files are in ``mbuild/utils/reference``, but on installation, they're moved to somewhere in the user's python site-packages directory. Parameters name : str Name of the file to load (with respect to the reference/ folder). """

    fn = resource_filename('mbuild', os.path.join('utils', 'reference', name))
    if not os.path.exists(fn):
        raise IOError('Sorry! {} does not exists.'.format(fn))
    return fn