Where there is a will, there is a way

This week I got 2 assignments and finally I figured it out.

Assume that I am under a big tree and I can only see leaves above me. After I pick leaves one by one until no more leaves left on a tree, then I am able to see clear sky above.

After reading books, looking through the codes line by line, finally I got the answer.

Old saying, where,there is a will, there is a way.