<aside> ✅
Upper Camel Case
</aside>
<aside> ✅
Lower Camel Case
</aside>
<aside> ✅
Lower Camel Case
</aside>
<aside> ✅
lower_snake_case
</aside>
Upper_Camel_Case → UserService
Lower_Camel_Case → findById
Lower_snake_case → lower_snake
Upper_snake_case → MAX_LENGTH