Golang中，利用反射和interface就可以做到，不废话看代码

func main() {
  b := []string{"a","b","c","e","f","a","g","c"}
   sort.Strings(b)
   fmt.Println(Duplicate(b))
   

  c := []int{1,1,2,4,6,7,8,3,5,8}
   sort.Ints(c)
   fmt.Println(Duplicate(c))
}
func Duplicate(a interface{}) (ret []interface{}) {
   va := reflect.ValueOf(a)
   for i := 0; i < va.Len(); i++ {
      if i > 0 && reflect.DeepEqual(va.Index(i-1).Interface(),va.Index(i).Interface()) {
         continue
      }
      ret = append(ret,va.Index(i).Interface())
   }
   return ret
}