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## ispowerof2
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### Instructions
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Write a program that determines if a given number is a power of 2.
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This program must print `true` if the given number is a power of 2, otherwise it prints `false`.
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- If there is more than one or no argument the program should print a newline ("`\n`").
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- Error cases have to be handled.
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### Usage :
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```console
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student@ubuntu:~/ispowerof2$ go build
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student@ubuntu:~/ispowerof2$ ./ispowerof2 2 | cat -e
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true$
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student@ubuntu:~/ispowerof2$ ./ispowerof2 64 | cat -e
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true$
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student@ubuntu:~/ispowerof2$ ./ispowerof2 513 | cat -e
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false$
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student@ubuntu:~/ispowerof2$ ./ispowerof2
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student@ubuntu:~/ispowerof2$ ./ispowerof2 64 1024
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student@ubuntu:~/ispowerof2$ ./ispowerof2 notanumber | cat -e
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strconv.Atoi: parsing "a": invalid syntax$
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student@ubuntu:~/ispowerof2$
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```
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