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Exercise 1.23 - Remove comments from a C program
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Question
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Write a program to remove all comments from a C program. Don't forget to handle
quoted strings and character constants properly. C comments don't nest.


Solution
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.. literalinclude:: cprogs/ex_1.23_remcomments.c
   :language: c

Explanation
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If two subsequent characters start with `/` and `*`, we say we are in-comment,
If we find two characters which are `/` and `/`, we will print the first
character and start treating the second `/` as the possible start of comment. In
the same manner, if we encouter a single quote or a double quote character, then
we understand we are inside a quoted string, so we putchar everything before we
find the matching character again. Within a quoted string, if we encouter a
special character, then we try to read them literally as two characters and
print them.

If / is followed by any other character, we simply print them.