#756 Refactor: map like list bankName2Code refactored to Map #755
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Summary
It closes #756
![스크린샷 2024-03-12 오후 10 11 18](https://private-user-images.githubusercontent.com/25361985/312088296-dc277d5b-41dc-45b1-9ad1-615a810b389a.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.s_L0NL-TgdCy5Opf6-17CggdwpKpd2pzuj6vERUxcOU)
Use Map prototype explicitly. Avoid defining map as array.
Also, use Map.get() function rather Array.find() function in these similar scenarios.