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ex13.44 about size and length function

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in the `ex13_44_47.h`, the size and length function is different. ~~~cpp size_t size() const { return end - elements; } size_t length() const { return end - elements - 1;...

https://interviewguide.cn/notes/03-hunting_job/02-interview/01-01-07-basic.html#_128%E3%80%81%E7%94%A8c%E8%AF%AD%E8%A8%80%E5%AE%9E%E7%8E%B0c-%E7%9A%84%E7%BB%A7%E6%89%BF 这一段，用 C 语言的函数指针来模拟继承和多态，为什么 p2 可以直接调用_b 的 _fun() ，但是 _b 只有一个 _A 的对象 `_a_ `，并没有这个函数指针。 ```c //C语言模拟继承与多态的测试 _A _a; //定义一个父类对象_a _B _b; //定义一个子类对象_b _a._fun = _fA; //父类的对象调用父类的同名函数 _b._a_._fun = _fB;...

Fix suggestion-cases-error of `empty_line_after_outer_attr`

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Fixes: rust-lang/rust-clippy#14980 changelog: Fix suggestion-cases-error of [`empty_line_after_outer_attr`]

Fix `println_empty_string` suggestion caused error when there is a `,` after arg

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Closes: rust-lang/rust-clippy#16167 changelog: [`println_empty_string`]: fix suggestion caused error when there is a comma after arg.

Fix `if_then_some_else_none` FP when encountering `await` codes

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changelog: Fix FP of [`if_then_some_else_none`] when the `then` block contains `await` codes. That is because `bool:then` doesn't work with await code. Closes: rust-lang/rust-clippy#16176