Apply Copilot suggestions

Author: emlautarom1

Cargo.toml

@@ -29,7 +29,6 @@ hex = { version = "^0.4.3" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }
 tokio = { version = "1", features = ["full"] }
-tokio-util = { version = "0.7.17" }
 tower = { version = "0.5.2", features = ["full"] }
 libp2p = { version = "0.56", features = ["full", "secp256k1"] }
 prost = "0.14"

crates/charon/src/expbackoff/mod.rs

@@ -34,7 +34,7 @@ where
         let mut backoff = self.base_delay;
         let mut retries = self.retries;
 
-        // SAFE: Substraction is only performed when retries > 0
+        // SAFE: Subtraction is only performed when retries > 0
         #[allow(clippy::arithmetic_side_effects)]
         while backoff < self.max_delay && retries > 0 {
             backoff = backoff.mul_f64(self.multiplier);
@@ -173,12 +173,15 @@ impl<R> ExponentialBackoffBuilder<R> {
         if self.jitter > 100.0 {
             return Err(InvalidBackoff("jitter must not be greater than 100"));
         }
-        if !self.jitter.is_finite() {
+        if self.jitter.is_infinite() || self.jitter.is_nan() {
             return Err(InvalidBackoff("jitter must be finite"));
         }
         if self.multiplier < 0.0 {
             return Err(InvalidBackoff("multiplier must not be negative"));
         }
+        if self.multiplier.is_infinite() || self.multiplier.is_nan() {
+            return Err(InvalidBackoff("multiplier must be finite"));
+        }
 
         Ok(ExponentialBackoff {
             base_delay: self.base_delay,
@@ -323,15 +326,15 @@ mod tests {
         instance.tried();
         assert_eq!(total_time, Duration::from_secs(7));
 
-        // third backoff
+        // fourth backoff
         total_time += instance.backoff();
         instance.tried();
         assert_eq!(total_time, Duration::from_secs(15));
 
         // reset
         instance.reset();
 
-        // fourth backoff
+        // fifth backoff
         total_time += instance.backoff();
         instance.tried();
         assert_eq!(total_time, Duration::from_secs(16));