Add Strings LeetCode

Given two non-negative numbers num1 and num2 represented as string, return the sum of num1 and num2.

NOTE:

• The length of both num1 and num2 is < 5100.
• Both num1 and num2 contains only digits 0-9.
• Both num1 and num2 does not contain any leading zero.
• You must not use any built-in BigInteger library or convert the inputs to integer directly.

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Solution