Transformation

import java.util.Collections
import java.util.ArrayList

class SecretHandshake {

static List<String> commands(int number) {
    def res = new ArrayList()
    if (number & 1) res << "wink"
    if (number & 2) res << "double blink"
    if (number & 4) res << "close your eyes"
    if (number & 8) res << "jump"
    if (number & 16) Collections.reverse(res)  
    return res       
}

}