Method into_inner

crates/codegen/src/csharp.rs:1373–1378

(mut self)

    }

    pub fn into_inner(mut self) -> String {
        self.dedent(1);
        writeln!(self, "}}");

        self.output.into_inner()
    }
}

fn autogen_csharp_sum(module: &ModuleDef, sum_type_name: String, sum_type: &SumTypeDef, namespace: &str) -> String {