Main project structure

.gitignore

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+/target
+/Cargo.lock
+/.idea

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "waku"
+version = "0.1.0"
+
+[[package]]
+name = "waku-sys"
+version = "0.1.0"

Cargo.toml

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+[workspace]
+
+members = [
+    "waku",
+    "waku-sys"
+]

waku-sys/Cargo.toml

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

waku-sys/build.rs

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+fn main() {}

waku-sys/src/lib.rs

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

waku/Cargo.toml

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

waku/src/lib.rs

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