Feature #1: Add Likes

Description

For the first feature of the Twitter application, we are creating an API that calculates the total number of likes on a person’s Tweets. For this purpose, our team member has already extracted the data and stored it in a simple text file for us. We have to create a module that takes two numbers at a time and returns the sum of the numbers. The inputs were extracted from a text file, so they are in the form of strings. The limitation of the API is that we want all of the values to remain strings. We cannot even convert the string to numbers temporarily.

For example, let’s say we are given the strings "1545" and "67" as input. Our module should not convert these into integers while computing the sum and return "1612".