Correct clippy, remove Monero build depends

.github/actions/build-dependencies/action.yml

@@ -11,12 +11,6 @@ runs:
         solc-select install 0.8.9
         solc-select use 0.8.9
 
-    - name: Install Monero Dependencies
-      shell: bash
-      run: |
-        sudo apt update
-        sudo apt install build-essential libboost-all-dev libsodium-dev
-
     - name: Install WASM toolchain
       uses: actions-rs/toolchain@v1
       with:

coins/monero/src/ringct/clsag/mod.rs

@@ -270,7 +270,7 @@ impl Clsag {
   ) -> Result<(), ClsagError> {
     // Preliminary checks. s, c1, and points must also be encoded canonically, which isn't checked
     // here
-    if ring.len() == 0 {
+    if ring.is_empty() {
       Err(ClsagError::InvalidRing)?;
     }
     if ring.len() != self.s.len() {