diff --git a/rln/src/circuit.rs b/rln/src/circuit.rs
index ba7bf13..4dadf39 100644
--- a/rln/src/circuit.rs
+++ b/rln/src/circuit.rs
@@ -28,7 +28,7 @@ pub fn ZKEY() -> ProvingKey<Bn254> /*, ConstraintMatrices<Fr>)*/ {
 }
 
 pub fn VK() -> VerifyingKey<Bn254> {
-    let mut verifyingKey: VerifyingKey<Bn254>;
+    let verifyingKey: VerifyingKey<Bn254>;
 
     if Path::new(VK_PATH).exists() {
         let verifyingKey = vk_from_json(VK_PATH);
@@ -46,7 +46,7 @@ pub fn CIRCOM() -> CircomBuilder<Bn254> {
     let cfg = CircomConfig::<Bn254>::new(WASM_PATH, R1CS_PATH).unwrap(); // should be )?; but need to address "the trait `From<ErrReport>` is not implemented for `protocol::ProofError`"
 
     // We build the circuit
-    let mut builder = CircomBuilder::new(cfg);
+    let builder = CircomBuilder::new(cfg);
 
     builder
 }
@@ -127,7 +127,7 @@ fn vk_from_json(vk_path: &str) -> VerifyingKey<Bn254> {
     let json = std::fs::read_to_string(vk_path).unwrap();
     let json: Value = serde_json::from_str(&json).unwrap();
 
-    let mut vk = VerifyingKey {
+    let vk = VerifyingKey {
         alpha_g1: json_to_g1(&json, "vk_alpha_1"),
         beta_g2: json_to_g2(&json, "vk_beta_2"),
         gamma_g2: json_to_g2(&json, "vk_gamma_2"),
diff --git a/rln/src/lib.rs b/rln/src/lib.rs
index 576866f..3b71b39 100644
--- a/rln/src/lib.rs
+++ b/rln/src/lib.rs
@@ -119,7 +119,7 @@ mod test {
         // We generate all relevant keys
         let provingKey = &ZKEY();
         let verificationKey = &VK();
-        let mut builder = CIRCOM();
+        let builder = CIRCOM();
 
         // Let's generate a zkSNARK proof
         let (proof, inputs) = generate_proof(builder, provingKey, rlnWitness).unwrap();
diff --git a/rln/src/main.rs b/rln/src/main.rs
index 7167879..2063c88 100644
--- a/rln/src/main.rs
+++ b/rln/src/main.rs
@@ -1,19 +1,16 @@
-/// This is basic entry point for `cargo run` to play around with proof,
-/// outputs, etc.
-///
-use ark_circom::{CircomBuilder, CircomConfig};
-use ark_std::rand::thread_rng;
+
+
 use color_eyre::Result;
 
-use ark_bn254::Bn254;
-use num_bigint::BigInt;
+
+
 
 // Tracing
 use ark_relations::r1cs::{ConstraintLayer, ConstraintTrace, TracingMode};
 use tracing_subscriber::layer::SubscriberExt;
 
 // JSON
-use serde::Deserialize;
+
 
 use rln::circuit::{CIRCOM, VK, ZKEY};
 use rln::protocol::{generate_proof, initRLNWitnessFromJSON, verify_proof};
@@ -77,7 +74,7 @@ fn groth16_proof_example() -> Result<()> {
     // We generate all relevant keys
     let provingKey = &ZKEY();
     let verificationKey = &VK();
-    let mut builder = CIRCOM();
+    let builder = CIRCOM();
 
     // We compute witness from the json input example
     let rlnWitness = initRLNWitnessFromJSON(input_json_str);
diff --git a/rln/src/public.rs b/rln/src/public.rs
index f4109d8..cb33cec 100644
--- a/rln/src/public.rs
+++ b/rln/src/public.rs
@@ -58,7 +58,7 @@ impl RLN {
         let cfg =
             CircomConfig::<Bn254>::new("./resources/rln.wasm", "./resources/rln.r1cs").unwrap();
 
-        let mut builder = CircomBuilder::new(cfg);
+        let builder = CircomBuilder::new(cfg);
 
         // create an empty instance for setting it up
         let circom = builder.setup();
@@ -72,7 +72,7 @@ impl RLN {
         println!("Public inputs {:#?} ", inputs);
 
         let leaf = Field::from(0);
-        let mut tree = PoseidonTree::new(21, leaf);
+        let tree = PoseidonTree::new(21, leaf);
 
         RLN {
             circom,
@@ -197,7 +197,7 @@ impl RLN {
         // let tree = IncrementalMerkleTree::empty(hasher, merkle_depth);
 
         let leaf = Field::from(0);
-        let mut tree = PoseidonTree::new(21, leaf);
+        let tree = PoseidonTree::new(21, leaf);
 
         RLN {
             circom,
@@ -208,7 +208,7 @@ impl RLN {
 
     /// returns current membership root
     /// * `root` is a scalar field element in 32 bytes
-    pub fn get_root<W: Write>(&self, mut result_data: W) -> io::Result<()> {
+    pub fn get_root<W: Write>(&self, _result_data: W) -> io::Result<()> {
         //let root = self.tree.get_root();
         // Converts PrimeFieldRepr into LE
         //root.into_repr().write_le(&mut result_data)?;