If given two strings, each containing a number larger than 32-bit, how do you add them and return the result as a string?

To add two large numbers represented as strings, simulate the manual process of addition. Iterate through the strings from right to left, adding corresponding digits along with any carry-over from the previous position. Store the resulting digit (the sum modulo 10) and update the carry-over (the sum divided by 10). Continue this until both strings are exhausted and the carry is zero. The result is built in reverse and should be reversed at the end.