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## activebits
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### Instructions
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Write a function, `ActiveBits`, that returns the number of active bits (bits with the value 1) in the binary representation of an integer number.
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### Expected function
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```go
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func ActiveBits(n int) uint {
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}
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```
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### Usage
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Here is a possible [program](TODO-LINK) to test your function :
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```go
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package main
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import (
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"fmt"
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piscine ".."
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)
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func main() {
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nbits := piscine.ActiveBits(7)
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fmt.Println(nbits)
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}
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```
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And its output :
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```console
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student@ubuntu:~/piscine/test$ go build
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student@ubuntu:~/piscine/test$ ./test
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3
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student@ubuntu:~/piscine/test$
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```
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