adding-big-numbers

Adding Big Numbers

We need to sum big numbers, and we require your help.

Write a function that returns the sum of two numbers. The input numbers are strings and the function must return a string.

Example

add("123", "321"); // returns "444"
add("11", "99");   // returns "110"

Notes

• The input numbers are big.
• The input is a string of only digits
• The numbers are positives