func plusOne(digits []int) []int {
    var new_digits = []int{0}
    
    len_digits := len(digits)
    for i := 0;i < len_digits;i++{
        new_digits = append(new_digits, digits[i]) 
    }
    
    new_digits[len_digits]++
    
    var flag int = 0
    for i := len_digits; i >= 0; i--{
        new_digits[i] += flag
        flag = new_digits[i] / 10 
        new_digits[i] = new_digits[i] % 10 
    }
    if new_digits[0] == 0{
        return new_digits[1:]
    }
    return new_digits[:]
    
}