[ ] 1. Explain what the main function in hello.c does, line by line
[ ] 2. Add a comment above every function explaining what it does and why
[ ] 3. Find any lines where we forgot to check the return value of fopen or malloc
[ ] 4. Write a Makefile that compiles all .c files in this directory with -Wall -Wextra
[ ] 5. Create a test input file called test_input.txt with 5 edge cases for this program
[ ] 6. Run make and fix every compiler warning
[ ] 7. Add a usage message that prints when the user runs the program with no arguments
[ ] 8. Review this project for CSCD 240 style: 4-space indent, K&R braces, no magic numbers