Array # 8 : Plus One

plusone.go

/*
You are given a large integer represented as an integer array digits,
where each digits[i] is the ith digit of the integer. 
The digits are ordered from most significant to least significant in left-to-right order.
The large integer does not contain any leading 0's.
*/

func plusOne(digits []int) []int {
    digitsStr := "" 
    for i:= 0 ; i < len(digits) ; i++ {
        d := strconv.Itoa(digits[i])
        digitsStr += d
    }
    
    // Digits constraints are >= 100 , so let's convert the string to big number 
    n:= new(big.Int)
    n, ok := n.SetString(digitsStr, 0)
	if !ok {
        errors.New("Failed parsing string as big number")
	}
    
    one := big.NewInt(1)
    
    newNumber := n.Add(n,one)

    // Convert big int to string
    newNumberStr := newNumber.String()
    
    // Create the new digits arrays after it's being increamented
    newDigits := []int{}
    
    for _, numberStr := range newNumberStr {
        // Conver rune to int
        num, _ := strconv.Atoi(string(numberStr))
       
       newDigits = append(newDigits, num)
    }
    
    return newDigits
}