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If they had included a test case in which they appended 1 character 10^6 times (which falls within the problem constraints), you would have had to store around 10^12 bytes (1TB) in memory, far larger than is allowed on here. Apparently they didn't push the test cases to the limit.
That being said, I think your solution is pretty cool, and I would say that it absolutely does use the stack concept.
@erbo_xu you've got a point there,you're absolutely right about memory management,i'll keep that in mind when i solve further problem.