Add practice exercise `rational-numbers`#248

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natanaelsirqueira:add-exercise-rational-numbers

Commits on Feb 28, 2023

Add practice exercise `rational-numbers`
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Commits on Mar 1, 2023

Make `base` argument of `power_of_real` function a float
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Add label to `base` argument of `power_of_integer` function
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Remove unnecessary conversion of denominator to its absolute value
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