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Add two non-negative integers given as digit strings and return the sum, and explain the time and space complexity of your approach.

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You are given a function that can add only two single digits. Using it, write a function that adds two non-negative integers supplied as strings and returns the sum as a string.If given two strings, each containing a number larger than 32-bit, how do you add them and return the result as a string?Add two binary strings of up to 100,000 digits each and return the sum as a binary string with no leading zeros, without relying on a built-in big-integer type.

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