Hotels (2 points)
=================

A travel agency saves the available hotels in a file. Each line
contains the following data for a hotel, separated by a colon (``:``):
the name (:class:`str`), the price for a night (:class:`int`), the
number of stars (:class:`int`) and a variable number of names
(:class:`str`) corresponding to the hotel facilities.

Write function :py:func:`hotels` that takes the name of a file as
such described (:class:`str`), the name of a second file
(:class:`str`), an amount in euros (:class:`int`) and a :class:`list`
of required facilities (:class:`str`). This function analyses the
hotels given in the first file and writes in the second file those
hotels that meet the following conditions:

  * the hotel night price is less than or equal to the given amount and
  * there is at least one of the required facilities in the hotel.

In this second file, the hotels are in the same order as in the
first given file. Lines of this second file have the following data, also
separated by a colon: the name, a string with as much asterisks
(``*``) as the number of stars of the hotel, the price per night and
the number of required facilities offered by the hotel.

Save this function in file ``hotels.py``.

Example:

For a data file with the name ``'hotcan1.txt'`` with the following content:

.. literalinclude:: solution/hotcan1.txt
   :language: text
	   
and executing the following statements:

.. literalinclude:: test-hotels.txt
   :language: python
   :lines: 10-11


an output file with name ``'hotfin1.txt'`` will be created with the
following content:

.. literalinclude:: solution/hotfin1.txt
   :language: text

.. note::

   Tests for automatic debugging are provided in file :download:`test-hotels.txt`.