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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 v1_fc_get(visid_to_dbid, store, cid):
    '''Retrieve a single feature collection.

    The route for this endpoint is:
    ``/dossier/v1/feature-collections/<content_id>``.

    This endpoint returns a JSON serialization of the feature collection
    identified by ``content_id``.
    '''
    fc = store.get(visid_to_dbid(cid))
    if fc is None:
        bottle.abort(404, 'Feature collection "%s" does not exist.' % cid)
    return util.fc_to_json(fc)