How to get unique and latest item of slice in Go (Golang)

latest.go

package main

import (
	"fmt"
)

func main() {
	sl := []string{"zero", "one", "two", "one", "zero", "three", "five", "four", "five"}

	duplicateIndex := []int{}

	for i, item := range sl {
		theRest := sl[i+1:]

		for _, obj := range theRest {
			if item == obj {
				duplicateIndex = append(duplicateIndex, i)
				break
			}
		}
	}

	count := 0
	for _, index := range duplicateIndex {
		sl = append(sl[:(index-count)], sl[(index-count)+1:]...)
		count++
	}

	fmt.Println(sl)
}