- https://www.academia.edu/10297206/Secrets_of_printf_
- https://www.tutorialspoint.com/c_standard_library/stddef_h.htm
- https://man7.org/linux/man-pages/man1/find.1.html
- write (man 2 write)
- malloc (man 3 malloc)
- free (man 3 free)
- va_start (man 3 va_start)
- va_end (man 3 va_end)
- va_copy (man 3 va_copy)
- va_arg (man 3 va_arg)