You are graded on the quality and organization of your C code. A program that ``works'' but is extremely disorganized might receive a failing grade.
We may test your implementation of delist using automated testing, and these tests may play a role in how the correctness of your code is evaluated. To make this possible, your code should compile and allow testdiffeq to run when your diffeq.c is present in the same CDF directory as Makefile, testdiffeq.c, and diffeq.h.
Your diffeq.c must be in C (not C++) and must compile and run on the CDF Unix system, using the compilation commands in Makefile. Other C compilers may have incompatible extensions or modifications.