How to use macros in multiple Rust module files?

Hello! I'm learning Rust and ran into a problem when trying to move macros into separate modules. I have a project where I defined a useful macro `my_println!` in `main.rs`. I want to use it in other modules that are in separate files. Here's my project structure: ``` src/ main.rs utils/ mod.rs helper.rs ``` In `main.rs` I defined the macro: ```rust macro_rules! my_println { ($($arg:tt)*) => { println!("[LOG] {}", format!($($arg)*)); }; } mod utils; ``` In `utils/mod.rs` I declared the submodule: ```rust pub mod helper; ``` In `utils/helper.rs` I'm trying to use the macro: ```rust pub fn do_something() { my_println!("Hello from helper!"); } ``` But the compiler gives an error: `error: cannot find macro 'my_print