Brackets
- Check for multiple inputs "{}" "[]"
- Check for closing only "]"
- Can't use malloc
Itoa_base
- Check the lowest boundary in integer
- Check invalid base
- Ends string
Print_memory
- Use unsigned const = const unsigned char *ptr = addr;
- printable string ' ' to '~'
- col and i;
rpn_calc
- Handle division by zero
- Can use malloc and itoa