Add clippy (#191)

* Organize imports

Use rustfmt to organize imports.  Resolve #162

* remove unused imports

* Fix clippy complaints

* add clippy github action

* remove comment for @arnaucube

.github/workflows/clippy.yml

@@ -0,0 +1,21 @@
+name: Clippy Check
+
+on:
+  pull_request:
+    branches: [ main ]
+    types: [ready_for_review, opened, synchronize, reopened]
+  push:
+    branches: [ main ]
+
+jobs:
+  rustfmt:
+    if: github.event.pull_request.draft == false
+    name: Rust formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: clippy
+      - name: Check lints with clippy
+        run: cargo clippy