Hitting a brick wall

#44 Connect C with Crystal by LibU
#45 Refactoring Scrn methods
#46 Refactoring Makefile
#47 Implement IDT ISRS
#48 Call idt_install and isrs_install from Crystal
#49 Expand stack size to 4096 * 4 to prevent page faults
#50 Display kernel info
#51 Bump up Crystal version to 0.22.0
#52 Refer to linker symbols - Enable to refer to linker symbols from C
#53 Implement switch_context
#54 Reconstruct directory structure
#55 Implement tasks (but it's incomplete)

Ummmm......I need a fundamental restructuring.