refactor: examNumberUtil 수정

[chominju02]

✨ 구현한 기능

📢 논의하고 싶은 내용

🎸 기타

Summary by CodeRabbit

• Bug Fixes
  • Updated exam number formatting to remove unnecessary leading zeros from area code fields.

[gemini-code-assist]

Summary of Changes

Hello @chominju02, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

이 PR은 ExamNumberUtil 클래스의 formatExamNumber 메서드에서 areaCode의 숫자 서식 지정을 조정합니다. 이 변경은 areaCode가 더 이상 선행 0으로 패딩되지 않도록 하여, 특정 번호 체계에 맞추거나 이전의 의도치 않은 패딩을 수정하는 데 필요할 수 있습니다.

Highlights

• ExamNumberUtil 수정: formatExamNumber 메서드에서 areaCode의 서식 지정이 "%02d"에서 "%d"로 변경되어, 더 이상 두 자리 숫자로 패딩되지 않습니다.

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[coderabbitai]

Walkthrough

A format string pattern in the exam number utility was modified to remove zero-padding from the areaCode parameter, changing from %02d to %d while keeping other format specifiers unchanged.

Changes

Cohort / File(s)	Summary
Exam Number Formatting src/main/java/life/mosu/mosuserver/application/examapplication/util/ExamNumberUtil.java	Modified format string in formatExamNumber from "%d%02d%02d%04d" to "%d%d%02d%04d", removing zero-padding from areaCode parameter while retaining padding for schoolCode and personalCode

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Single-file change with a straightforward format string modification. No logic alterations, control flow changes, or parameter validation impacts.

Poem

🐰 A number's format takes a hop,
Padding rules we gently drop,
The areaCode roams free and wild,
While schoolCode and personal stay mild,
Exam numbers dance anew! ✨

Pre-merge checks and finishing touches

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description Check	⚠️ Warning	The pull request description includes the required section headers but each section only contains placeholder dashes without any meaningful details on the implemented functionality, discussion points, or additional context, making the description largely incomplete.	Fill in each template section with a concise summary of the implemented changes, any questions or design considerations for reviewers, and any other relevant notes or context under the 기타 section.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title indicates a refactor of the ExamNumberUtil class, matching the file changed, but it is overly generic and does not specify what aspect was modified, such as the change to the string formatting pattern.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/examNumberBatch

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 20e381b and ec371ba.

📒 Files selected for processing (1)

• src/main/java/life/mosu/mosuserver/application/examapplication/util/ExamNumberUtil.java (1 hunks)

🔇 Additional comments (1)

src/main/java/life/mosu/mosuserver/application/examapplication/util/ExamNumberUtil.java (1)

16-16: Confirm removal of zero-padding for areaCode

• Exam numbers now vary in length (e.g. areaCode=5 → "152000" vs previously "10520000"), breaking fixed-length assumptions in DB columns, lexicographic ORDER BY, parsing/validation, and tests
• Ensure this change is intentional: update schema, sorting logic, test fixtures, documentation, and migrate existing data as needed

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[gemini-code-assist]

Code Review

이 PR은 수험 번호 생성 시 사용되는 포맷 문자열을 수정하여, 지역 코드(areaCode)에 적용되던 0 채우기(zero-padding)를 제거하는 변경을 포함하고 있습니다. 이 변경은 schoolCode 등 다른 코드와의 포맷 일관성을 해치고, roundCode와 areaCode를 구분하기 어렵게 만들어 수험 번호의 모호성을 유발할 수 있습니다. 이는 잠재적으로 심각한 버그로 이어질 수 있으므로, 코드 일관성과 명확성을 위해 기존 포맷을 유지하도록 수정 제안을 남겼습니다.

[gemini-code-assist]

지역 코드(areaCode)의 포맷을 %02d에서 %d로 변경하셨습니다. 이로 인해 areaCode가 한 자릿수일 경우 0으로 채워지지 않아 수험 번호의 길이가 달라지게 됩니다.

schoolCode는 %02d, personalCode는 %04d로 고정 길이 포맷을 유지하고 있는데, areaCode만 가변 길이로 변경하면 포맷의 일관성이 깨집니다.

더 중요한 점은, roundCode와 areaCode가 모두 패딩 없이 %d로 포맷될 경우, 두 값을 구분하기 어려워져 모호함이 발생할 수 있습니다. 예를 들어, roundCode=1, areaCode=23인 경우와 roundCode=12, areaCode=3인 경우 모두 123...으로 시작하여 동일한 수험 번호 앞자리를 생성할 수 있습니다.

따라서 수험 번호의 명확성과 일관성을 위해 areaCode의 포맷을 다시 %02d로 복원하는 것을 강력히 권장합니다.

Suggested change

	"%d%d%02d%04d",
	"%d%02d%02d%04d",