[Red] testMultipleTag

Some tags in the same level
[Red] testIsTagFollowedByClosingTag
testIsTagFollowedByClosingTagSimple passed
Recursion + divide and conquer strategy
[Green] We can deal with nested elements like:
<b><b></b></b> and with elements in the same level like:
<b></b><b></b>
And both in the same time.

We also deal with generic tags