package main

import (
    "fmt"
)

func main() {
    s := []interface{}{1, 2, 3, 4, 5, 6, 7, 8}
HERE:
    for k, v := range s {
        if v == 4 || v == 6 || v == 7 {
            // temp := s[k+1:]
            fmt.Println("k", k)
            temp := make([]interface{}, 0)
            for _, v := range s[k+1:] {
                temp = append(temp, v)
            }
            fmt.Println("temp1", temp)
            s = append(s[:k], "(")
            fmt.Println(s)
            s = append(s, []interface{}{fmt.Sprintf("%d", v), fmt.Sprintf("%d", v)}...)
            fmt.Println(s)
            s = append(s, ")")
            fmt.Println(s)
            fmt.Println("temp2", temp)
            s = append(s, temp...)
            fmt.Println(s)
            goto HERE
        }
    }
}