Init

.gitignore

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+/target
+**/target
+/Cargo.lock
+
+.vscode/
+*.code-workspace
+.idea/
+.DS_Store
+
+*.swp
+*.swo
+*~

Cargo.toml

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+[workspace]
+members = [
+    "solar_engine",
+    "simulator"
+]

simulator/Cargo.toml

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+[package]
+name = "simulator"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+solar_engine = { path = "../solar_engine" }

simulator/src/main.rs

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

solar_engine/Cargo.lock

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

solar_engine/Cargo.toml

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+[package]
+name = "solar_engine"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

solar_engine/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);
+    }
+}