Amabon (2 points)
=================

Amabon, an e-commerce company wants us to help with its costumers'
purchases. It has a nested :py:class:`list` in which each sublist
corresponds to a customer. The first item of each customer list is its
name (:py:class:`str`) and then there are some :py:class:`tuple`
corresponding to each individual product that this costumer has
bought. Each tuple has two items: the product name (:py:class:`str`)
and the number of these products purchased by this costumer
(:py:class:`int`). There is also a dictionary of product prices
(:py:class:`dict`) with pairs of the form ``product_name :
price``. Prices are rounded to integers (:py:class:`int`).

Save the following function to file ``amabon.py``.

Write a **modifier** function :py:func:`amabon` that takes a list and
a dictionary as those described, and **modifies** the list by adding
at the end of each costumer the total amount spent in the bought
products. Examples:

.. literalinclude:: test-amabon.txt
      :language: python
      :lines: 3 - 12

.. note:: You have more tests in file :download:`test-amabon.txt`