Email
=====

We wish to automatically generate the email of a given professor according to its name, department and university. All of them are provided as a string with at most 3 capitalized words separated by ' ' (name and university are always 2 or 3 words whereas the department can also be single word).
The generated email must have the following format:

    - The username: The name initials in lowercase followed by a number corresponding to the number of occurrences of the initial letter of the first name in the whole name. For instance if the name is ``'Lluís Vila Grabulosa'`` the username is ``'lvg4'`` since ``'l'`` occurs 4 times in the name. Notice that both lowercase and capital letters and counted.
    - The ``@`` symbol.
    - The domain: The initials of the departament and the initials of the university, both in lowercase and separated by ``'.'``
    - The extension ``.edu``
    
Implement the following two Python functionsin the module :mod:`email` (file :file:`email.py`. Starting with the second one is recommended.

The first function is:

    ``email(name, dep, uni)``
        | takes ``name, dep, uni``, :class:`str` acording to the definition above
        | returns a :class:`str` with the email corresponding to this person according to the description above.

For exemple:

   .. literalinclude:: email-test.txt
      :language: python3
      :lines: 3-
      
Doctests are available at the :download:`email-test.txt` file.

This function **must** call the following function:

    **xtr_inis(s)**
    
        | takes ``s`` a :class:`str` formed by 1, 2 or 3 words separated by a ``' '``
        | returns a :class:`str` with the initials in lowercase

For exemple:

   .. literalinclude:: xtr_inis-test.txt
      :language: python3
      :lines: 3-
      
      
Doctests are available at the :download:`xtr_inis-test.txt` file.