OCT-2025-2 | Roman Pavlenko | Module-Complexity | Sprint 1 | Analyse and Refactor Functions - #1

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• I have titled my PR with Region | Cohort | FirstName LastName | Sprint | Assignment Title
• My changes meet the requirements of the task
• I have tested my changes
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Changelist

• refactoring "callculate_sum_and_product" function. Used one loop for two operations and changed the name "sum" to the "total".
• refactoring "find_common_items. Used sets for lists to delete duplicates
• refactoring "has_pair_common_items". Add variable which consists sum - first number, and because it's simplifies the logic we don't need the second loop anymore.
• refactoring "remove_duplicates" used set + loop to guarantee the positions of items.
• all tests still passed