add prefix to ErrType
Merge branch 'feature-utility' into develop
rename dir "include"
rm old dir
change the return type of getEntry()
Merge branch 'feature-array' into develop
change Makefile
change some return type
Merge branch 'feature-list' into develop
change the return type of push
getFront() -> get()
Revert "change the return type of push"

This reverts commit 1896959501e07c878ca423bc6bf8dc00582190a1.
change return type again
re change return type
Merge branch 'feature-stack' into develop
Merge branch 'feature-queue' into develop

Conflicts:
	inc/stack.h
	src/stack.c
add a type for compare function
Merge branch 'feature-utility' into develop
init
add sptree to Makefile targets