[SCRUM-60] 타이머 알림음 · Nexters/Mohanyang-iOS@440cadc

Force casts should be avoided (force_cast)

Implicitly unwrapped optionals should be avoided when possible (implicitly_unwrapped_optional)

Don't include vertical whitespace (empty line) after opening braces (vertical_whitespace_opening_braces)

Force casts should be avoided (force_cast)

Opening braces should be preceded by a single space and on the same line as the declaration (opening_brace)

Force unwrapping should be avoided (force_unwrapping)

Force casts should be avoided (force_cast)

Force unwrapping should be avoided (force_unwrapping)

Force unwrapping should be avoided (force_unwrapping)

Don't include vertical whitespace (empty line) after opening braces (vertical_whitespace_opening_braces)

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