[calculator] How to make [1,2] into [12]?

Need help
1

I’m making a calculator from scratch for practice.
When I press [1] then press [2] it should be [ 12 ] not [ 1,2 ]

how can we do that? what I thought was ( delete comma ) and ( converted to a number ) so that bubble can recognize it’s a number.

I’m a beginner and would appreciate your help!

2

I did it with workflow, if you have any idea please share here!!

3

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