chore: Reorganize file tree for easier onboarding. Rust project now at the root for simple git clone && cargo run

harmony_types/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "harmony_types"
+edition = "2024"
+version.workspace = true
+readme.workspace = true
+license.workspace = true

harmony_types/src/lib.rs

@@ -0,0 +1,26 @@
+pub mod net {
+    #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+    pub struct MacAddress(pub [u8; 6]);
+
+    impl MacAddress {
+        #[cfg(test)]
+        pub fn dummy() -> Self {
+            Self([0, 0, 0, 0, 0, 0])
+        }
+    }
+
+    impl From<&MacAddress> for String {
+        fn from(value: &MacAddress) -> Self {
+            format!(
+                "{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}",
+                value.0[0], value.0[1], value.0[2], value.0[3], value.0[4], value.0[5]
+            )
+        }
+    }
+
+    impl std::fmt::Display for MacAddress {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            f.write_fmt(format_args!("MacAddress {}", String::from(self)))
+        }
+    }
+}