Create crates

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "achievement-counter-cli"
+version = "0.1.0"
+
+[[package]]
+name = "achievement-counter-core"
+version = "0.1.0"

Cargo.toml

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+[workspace]
+
+members = [
+    "cli",
+    "core",
+]

cli/Cargo.toml

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+[package]
+name = "achievement-counter-cli"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

cli/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}

core/Cargo.toml

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+[package]
+name = "achievement-counter-core"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

core/src/lib.rs

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+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}