Interface use example 1

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ToDo

• [x] Create a basic calculator relaying on providers for each operation.
  • [x] Add provider.
  • [x] Subtract provider.
  • [x] Multiply provider.
  • [x] Divide provider.
• [x] Create an advanced calculator adding Exponent to the previous calculator operations.
  • [x] Exponent provider.

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Closed by #3