Golang changing strings

package main

import (
	"fmt"
)

// Accumulate takes a []string, applies func f to each
// element and returns the resulting []string.
func Accumulate(s []string, f func(string) string) []string {
	for i := range s {
		s[i] = f(s[i])
	}

	return s
}

func change(x string) string {
	x = x + "one"
	return x
}

func main() {
	a := []string{"Hello", "there"}
	fmt.Printf("Strings: %s\n", a)
	b := Accumulate(a, change)
	fmt.Printf("a strings: %s\n", a)
	fmt.Printf("b strings: %s\n", b)
}


Strings: [Hello there]
a strings: [Helloone thereone]
b strings: [Helloone thereone]