add some rules and bug fix

[SeanCai]

add rules
[Recommended] The total number of lines for a method should not be more than 80
[Recommended] Avoid using the negation operator '!'
[Mandatory] When doing date formatting, "y" should be written in lowercase for "year" in a pattern statement

 and some bug fix

[CLAassistant]

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[LQZYC]

ok

[imu2008]

OK