Code style change

[lxymahatma]

tl:dr:

• Rename Attribute to fit naming style
• use ; for empty class instead of {}
• fix typo in variable, string and comment
• some raw string changes
• use switch expression instead of switch statement

Only focus on 3 files because i mostly read those 3, i want to do more changes but im afraid the existed changes are already not fitting the code style so i just stop here. I want to do some rewrite for methods/classes but my coding skill might break the entire lib