Common prefix and suffix
========================

Save all functions into the same file named ``presuffix.py``.

#. Write the function :py:func:`common_prefix` that takes two strings
   each containing a word, and returns another string with the longest
   common prefix of these words.

   See the following examples:

   .. literalinclude:: prefix.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`prefix.txt<prefix.txt>` file.

#. Write the function :py:func:`common_suffix` that takes two strings
   each containing a word, and returns another string with the longest
   common suffix of these words.

   See the following examples:

   .. literalinclude:: suffix.txt
      :language: python3
      :lines: 3-

   .. note::
      More tests are provided in the :download:`suffix.txt<suffix.txt>` file.


.. rubric:: Solutions

A solution of these functions is provided in the
:download:`presuffix.py<solutions/presuffix.py>` file.