codebank 0.3.0

A powerful code documentation generator that creates structured markdown documentation from your codebase. Supports multiple languages including Rust, Python, TypeScript, and C with intelligent parsing and formatting. Features test code filtering, summary generation, and customizable documentation strategies.
Documentation 
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# Format Trait

```rust
pub trait Formatter {
    fn format(&self, strategy: BankStrategy) -> Result<String>;
}
```

Please implement the `Formatter` trait for all the units, so that they could output the formatted code based on different strategies. Then please refactor/rewrite the code in bank.rs to leverage this trait to format the code bank based on different strategies. Make sure the public interface of `CodeBank` is easy to use and understand.

Make sure you added detailed unit tests for the implemented `Formatter` trait. Also please put units for bank.rs.