<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