divide repository in src and lib

lib/macros/.gitignore

@@ -0,0 +1,2 @@
+/target
+/Cargo.lock

lib/macros/Cargo.toml

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+[package]
+name = "macros"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

lib/macros/src/lib.rs

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+#[allow(unused_macros)]
+
+macro_rules! dbg_println {
+    ($($arg:tt)*) => (#[cfg(debug_assertions)] println!($($arg)*));
+}