Hw7 calculator#13

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MikePuzanov wants to merge 6 commits intomasterfrom

Commits on Apr 24, 2021

made Calculator, tests still is waiting
MikePuzanov
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Commits on Apr 25, 2021

reboot tests
MikePuzanov
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add test
MikePuzanov
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Commits on May 21, 2021

fix mistakes
MikePuzanov
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Commits on Jun 3, 2021

add comments
MikePuzanov
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fix bugs
MikePuzanov
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