## ispowerof2
### Instructions
Write a program that determines if a given number is a power of 2. A number `n` is a power of 2 if it meets the following condition: **n = 2 m** where m is another integer number.
For example, **4 = 2 2** or **16 = 2 4** are power of 2 numbers while 24 is not.
This program must print `true` if the given number is a power of 2, otherwise it has to print `false`.
- If there is more than one or no argument, the program should print nothing.
- When there is only one argument, it will always be a positive valid `int`.
### Usage :
```console
$ go run . 2 | cat -e
true$
$ go run . 64
true
$ go run . 513
false
$ go run .
$ go run . 64 1024
$
```