Ports - Ngoc#31

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lebaongoc wants to merge 3 commits intoAda-C11:masterfrom

lebaongoc:master

Commits on Sep 9, 2019

implemeneted enqueue method
Ngoc Le
committed

Commits on Sep 30, 2019

implemented push and pop methods for Stack
lebaongoc
committed

Commits on Oct 1, 2019

implemented balanced(string) method and queue
lebaongoc
committed