Add One To Number: Interviewbit Solution

Problem Description:

Given a non-negative number represented as an array of digits,

add 1 to the number ( increment the number represented by the digits ).

The digits are stored such that the most significant digit is at the head of the list.

Example:

If the vector has [1, 2, 3]
the returned vector should be [1, 2, 4]
as 123 + 1 = 124.

Solution:

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