test: ktlint

[SeongYunKim]

Motivation:

• Explain why you're making this change and what problem you're trying to solve.

Modifications:

• List the modifications you've made in detail.

Commit Convention Rule

• Please commit your modification based by conventional commit
• This commit convention is referred from angular convention

Commit type	Description
feat	New Feature
fix	Fix bug
docs	Documentation only changed
ci	Change CI configuration
refactor	Not a bug fix or add feature, just refactoring code
test	Add Test case or fix wrong test case
style	Only change the code style(ex. white-space, formatting)
chore	It refers to minor tasks such as library version upgrade, typo correction, etc.

• If you want to add some more commit type please describe it on the Pull Request

Result:

Closes #. (If this resolves the issue.)

• Describe the consequences that a user will face after this PR is merged.