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Exercise 1.18 - Remove trailing blanks and tabs
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Question
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Write a program to remove trailing blanks and tabs from each line of input, and
to delete entirely blank lines.

Solution
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.. literalinclude:: cprogs/ex_1.18_remtrailbt.c
   :language: c

Explanation
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In the remove_trail function, we go to the very end of the line and the trace
back to the find the character which is not a space, tab and then replace it
with \0. This eliminates the trailing blanks in a line. For the empty lines
whose length is 0, we simply skip that from output and thus removing it.