remove unnecessary assignment
update fix_me.c to remove dependency on scanf
update fix_me.c to remove dependency on macros
add description of fix_me.c program to lecutre 04 debug
reorganize code folder
update lectures and labs to use new naming convention in code folder
add fix_me_too.c
update lecture 04 debug
Merge branch 'jekyll/update_debug_lecture' into gh-pages