chore: fix clippy warnings

Author: TobTheRock

examples/generate_headers.rs

@@ -5,9 +5,13 @@ use sframe::{
     header::Header,
     header::{Deserialization, Serialization},
 };
+use std::fmt::Write;
 
 fn bin2string(bin: &[u8]) -> String {
-    bin.iter().map(|x| format!("{x:08b} ")).collect()
+    bin.iter().fold(String::new(), |mut output, x| {
+        let _ = write!(output, "{x:08b} ");
+        output
+    })
 }
 
 fn main() {

src/util.rs

@@ -1,9 +1,15 @@
 // Copyright (c) 2023 GoTo Group, Inc
 // SPDX-License-Identifier: Apache-2.0 AND MIT
 
+#[cfg(test)]
+use std::fmt::Write;
+
 #[cfg(test)]
 pub(crate) fn bin2string(bin: &[u8]) -> String {
-    bin.iter().map(|x| format!("{x:08b} ")).collect()
+    bin.iter().fold(String::new(), |mut output, x| {
+        let _ = write!(output, "{x:08b} ");
+        output
+    })
 }
 
 #[cfg(test)]