Assignment name  : last_word
Expected files   : last_word.c
Allowed functions: write
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Write a program that takes a string and displays its last word followed by a \n.

A word is a section of string delimited by spaces/tabs or by the start/end of
the string.

If the number of parameters is not 1, or there are no words, display a newline.

Example:

$> ./last_word "FOR PONIES" | cat -e
PONIES$
$> ./last_word "this        ...       is sparta, then again, maybe    not" | cat -e
not$
$> ./last_word "   " | cat -e
$
$> ./last_word "a" "b" | cat -e
$
$> ./last_word "  lorem,ipsum  " | cat -e
lorem,ipsum$
$>