Clarify description and add shorter complex test for top20Words

Kotlin-Polytech / KotlinAsFirst

Задачи для онлайн-курса "Котлин как первый язык программирования"

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Closed gagarski closed 6 years ago

gagarski commented 7 years ago

Clarify description: Is hello inside hello42 a word? (Not it's unclear if we should treat it as a word or just ignore it).
Add test shorter than Eugene Onegin but that covers corner case (punctuation after word, Ё letter, hello42 case etc.)