lru cache

more test

refactoring

refactoring

remove unecessary trick

refactoring

update words

version 0.3

[99%]LinkedList
[99%]Heap
[99%]Graph
[90%]HashTable
[80%]Tree
[80%]book

version 0.2

[99%]Array
[99%]LinkedList
[99%]Heap
[99%]Graph
[90%]HashTable
[75%]Tree
[70%]book

version 0.1

[99%]Array
[99%]LinkedList
[99%]Heap
[90%]Graph
[90%]HashTable
[75%]Tree
[60%]book