diff --git a/.github/workflows/cargo-test.yml b/.github/workflows/cargo-test.yml
new file mode 100644
index 0000000..91b9a73
--- /dev/null
+++ b/.github/workflows/cargo-test.yml
@@ -0,0 +1,28 @@
+name: Rust
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: rust
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install deps
+      run: sudo apt update && sudo apt install -y cargo
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+
diff --git a/README.md b/README.md
index 8089841..b3587d1 100644
--- a/README.md
+++ b/README.md
@@ -1,18 +1,5 @@
 # Leetcode
 
-My leetcode solutions in Rust
+My leetcode solutions
 
-
-## Usage
-
-Every directory under `problems/` is a cargo project which contains some basic test cases.
-
-The whole project is a cargo workspace,
-so all solutions can be tested using `cargo test` from repository root
-
-
-## Common
-
-The workspace contains a `common` crate which is used in tests
-and also contains leetcode-compatible definitions of common data structures,
-like `TreeNode` and `ListNode`
+![Visualization of this repo](./diagram.svg)
diff --git a/rust/README.md b/rust/README.md
index d7c84d1..8089841 100644
--- a/rust/README.md
+++ b/rust/README.md
@@ -1,3 +1,18 @@
 # Leetcode
 
-My leetcode solutions
+My leetcode solutions in Rust
+
+
+## Usage
+
+Every directory under `problems/` is a cargo project which contains some basic test cases.
+
+The whole project is a cargo workspace,
+so all solutions can be tested using `cargo test` from repository root
+
+
+## Common
+
+The workspace contains a `common` crate which is used in tests
+and also contains leetcode-compatible definitions of common data structures,
+like `TreeNode` and `ListNode`
diff --git a/rust/common/src/lib.rs b/rust/common/src/lib.rs
index 450e7cc..5b85170 100644
--- a/rust/common/src/lib.rs
+++ b/rust/common/src/lib.rs
@@ -9,17 +9,17 @@ macro_rules! assert_returns {
     // it as a string along with its result.
     // The `expr` designator is used for expressions.
     ($ret_value:expr, $func:expr, $($args:expr),*) => {
-        let result = $func($($args),*);
-
         let mut args_str: String = "".into();
         $(
             args_str += format!("{:?}, ", $args).as_str();
         )*
         args_str.pop();
         args_str.pop();
+        
+        let result = $func($($args),*);
 
         // `stringify!` will convert the expression *as it is* into a string.
-        let mut error_msg = format!(
+        let error_msg = format!(
             "{}({}) returned {:?}\nexpected result: {:?}\n",
             stringify!($func),
             args_str,
diff --git a/rust/problems/design-bitset/src/lib.rs b/rust/problems/design-bitset/src/lib.rs
index b5d326d..e559502 100644
--- a/rust/problems/design-bitset/src/lib.rs
+++ b/rust/problems/design-bitset/src/lib.rs
@@ -93,7 +93,7 @@ impl Bitset {
 
 #[cfg(test)]
 mod test {
-    use common::assert_returns;
+    
 
     use crate::Bitset;
 
diff --git a/rust/problems/three-sum/src/lib.rs b/rust/problems/three-sum/src/lib.rs
index 334e15a..79f9fef 100644
--- a/rust/problems/three-sum/src/lib.rs
+++ b/rust/problems/three-sum/src/lib.rs
@@ -250,7 +250,7 @@ impl Solution {
 
 #[cfg(test)]
 mod tests {
-    use common::{assert_returns, vec2d};
+    use common::{vec2d};
 
     use super::*;