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Add the `CString` type, which is an owned string that is guaranteed to have exactly one `NUL` byte at the end, i.e. the owned equivalent to `CStr` introduced earlier. It is used for interoperability with kernel APIs that take C strings. In order to do so, implement the `RawFormatter::new()` constructor and the `RawFormatter::bytes_written()` method as well. Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>