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Exercise 3.2 - escape sequences into the real characters
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Question
========

Write a function escape(s,t) that converts characters like newline and tab into
visible escape sequences like \n and \t as it copies the string t to s. Use a
switch. Write a function for the other direction as well, converting escape
sequences into the real characters.

.. literalinclude:: cprogs/ex_3.2_escape.c
   :language: c
   :tab-width: 4

Explanation
===========

C Program interpreters ``\n`` and ``\t`` as space characters and outputs them.
Our intention is to capture the ``\n`` and ``\t`` characters and display them
visibly as **\n** or **\t**. In order to do that we need to *escape* them, the
escaping is done by adding ``\`` character.

So in the program as soon as we see a ``\n`` character, in the array where we
are copying to, we copy ``\\`` character and add a ``n`` character and
similarly, when we see a ``\t`` character, in the array where we are copying
to, we copy ``\\`` character and add a ``t`` character.