package main
// import "fmt"
type Node struct {
    next *Node
    name string
}
var sink string
func foo(list *Node, names []string) {
    if len(names) > 0 {
        name := names[0]
        for i := 0; i < len(name); i++ {
            foo(&Node{list, name[i : i+1]}, names[1:]) // need not escape
        }
    } else if list != nil {
        // fmt.Printf("%s", list.name) // you don't want to to do this unless you are comparing output.
        sink = list.name
        foo(list.next, names)
    }
}
func main() {
    names := []string{"ant", "bat", "cat", "dog", "emu",
        "fox", "gnu", "hyena", "iguana", "jaguar"}
    foo(nil, names)
}