[URGENT: 36 hrs]: Edit code to pass unit tests.

We have built a dynamic memory allocator as an alternative for the built-in version provided by glibc. Specifically, it is an explicit free list allocator with next-fit placement, LIFO, coalescing, and block splitting without creating splinters. The complete code is written however, there are minor errors that prevent it from passing our unit test cases. Your job would be to fix bugs in the code that prevent us while respecting the original requirements of the project.