Given an integer num, return a string representing its base $7$ equivalent.

Constraints:

• $-10^7 \leq$ num $\leq 10^7$

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.