As a user I want to be able to insert a new number after an existing number on the stack so that I can add something in I forgot.
UAT
- [6, 4, 19, 6, 8] 3
<enter>311<insert>-> [6, 4, 311, 19, 6, 8] - [41] 1
<enter>19<insert>-> [19, 41] - [] 4
<enter>19<insert>–> []/error
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