func miniMaxSum(arr []int32) {
    sort.SliceStable(arr, func(i, j int) bool { return arr[i]<arr[j]})
    var sum int64 = 0 
    for i := range arr{
        sum += int64(arr[i])
    }
    fmt.Println(sum-int64(arr[len(arr)-1]), sum-int64(arr[0]))
}