Format code and document running cargo fmt

Author: ammario

CLAUDE.md

@@ -47,3 +47,7 @@ cargo clippy --all-targets -- -D warnings
 
 When the user asks to run clippy and provides the ability to run on both targets, try to run it
 on both targets.
+
+## Formatting
+
+After modifying code, run `cargo fmt` to ensure consistent formatting before committing changes.

build.rs

@@ -1,5 +1,5 @@
-use std::process::Command;
 use std::env;
+use std::process::Command;
 
 fn main() {
     // Retrieve crate version provided by Cargo
@@ -10,14 +10,19 @@ fn main() {
         .args(["rev-parse", "--short", "HEAD"])
         .output()
         .ok()
-        .and_then(|o| if o.status.success() {
-            Some(String::from_utf8_lossy(&o.stdout).trim().to_string())
-        } else {
-            None
+        .and_then(|o| {
+            if o.status.success() {
+                Some(String::from_utf8_lossy(&o.stdout).trim().to_string())
+            } else {
+                None
+            }
         })
         .unwrap_or_else(|| "unknown".to_string());
 
     // Export as environment variables for use in the code and tests
     println!("cargo:rustc-env=GIT_HASH={}", git_hash);
-    println!("cargo:rustc-env=VERSION_WITH_GIT_HASH={} ({})", version, git_hash);
+    println!(
+        "cargo:rustc-env=VERSION_WITH_GIT_HASH={} ({})",
+        version, git_hash
+    );
 }

tests/smoke_test.rs

@@ -16,9 +16,9 @@ fn test_httpjail_version() {
     let mut cmd = Command::cargo_bin("httpjail").unwrap();
     cmd.arg("--version");
     let hash = env!("GIT_HASH");
-    cmd.assert().success().stdout(
-        predicate::str::contains("httpjail").and(predicate::str::contains(hash)),
-    );
+    cmd.assert()
+        .success()
+        .stdout(predicate::str::contains("httpjail").and(predicate::str::contains(hash)));
 }
 
 #[test]