Given a string num representing a positive integer, return the string num after removing all of its trailing zeros.

Constraints:

• $1 \leq$ num.length $\leq 1000$

• num consists only of digits.

• num does not have any leading zeros.

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.