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## gcd
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### Instructions
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Write a program that takes two strings representing two strictly positive
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integers that fit in an int.
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Display their greatest common divisor followed by a newline (It is always a
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strictly positive integer).
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If the number of parameters is not 2, display a newline.
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All arguments tested will be valid positive `int` values.
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Example of output :
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```console
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student@ubuntu:~/student/gcd$ go build
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student@ubuntu:~/student/gcd$ ./gcd 42 10 | cat -e
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2$
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student@ubuntu:~/student/gcd$ ./gcd 42 12 | cat -e
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6$
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student@ubuntu:~/student/gcd$ ./gcd 14 77 | cat -e
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7$
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student@ubuntu:~/student/gcd$ ./gcd 17 3 | cat -e
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1$
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student@ubuntu:~/student/gcd$ ./gcd | cat -e
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$
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student@ubuntu:~/student/gcd$ ./gcd 50 12 4 | cat -e
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$
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student@ubuntu:~/student/gcd$
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```
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