rust: str: add `fmt!` macro
Add the `fmt!` macro, which is a convenience alias for the Rust `core::format_args!` macro. For instance, it may be used to create a `CString`: CString::try_from_fmt(fmt!("{}{}", "abc", 42))? Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
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