Getting wrong output for the Larger Number question

#1

I replicated the code in the video of the solution, but i am getting wrong output, please if you can check for the error?
link:-https://drive.google.com/file/d/1lS_jFQQp8yXqI_uURTY7XrXIOHwKWAx8/view?usp=sharing

#2

Try to solve this problem in O(n) time complexity.