Code refactoring + unit tests#1

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ArtemkaKun wants to merge 3 commits intotarikguney:masterfrom

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Commits on Apr 11, 2022

AsciiTableGenerator class was fully refactored
ArtemkaKun
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Counting column length was reimplemented to handle table without entities; magic value when applying header separators was explained
ArtemkaKun
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AsciiTableGeneratorTests were added (valid, tested in another solution)
ArtemkaKun
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