Feat/add calcular command

[PoorlyDefinedBehaviour]

• Adiciona o comando !calcular

[github-actions[bot]]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: :white_check_mark: success
  • Annotations: 0 total

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^{Report generated by eslint-plus-action}