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## lastword
### Instructions
Write a program that takes a string and displays its last word, followed by a
newline.
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 if there are no words, simply display
a newline.
Example :
```console
student@ubuntu:~/student/lastword$ go build
student@ubuntu:~/student/lastword$ ./lastword "FOR PONY" | cat -e
PONY$
student@ubuntu:~/student/lastword$ ./lastword "this ... is sparta, then again, maybe not" | cat -e
not$
student@ubuntu:~/student/lastword$ ./lastword " " | cat -e
$
student@ubuntu:~/student/lastword$ ./lastword "a" "b" | cat -e
$
student@ubuntu:~/student/lastword$ ./lastword " lorem,ipsum " | cat -e
lorem,ipsum$
student@ubuntu:~/student/lastword$
```