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