String Addition
STRING
MATH

Problem

Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2 as a string. You must not use any built-in library for handling large integers (such as BigInteger).

You must not convert the inputs to integers directly.

Examples

addStrings("2", "3") // returns "5" addStrings("40", "60") // returns "100" addStrings("25", "75") // returns "100"
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