replace comment with extracted function

src/uu/env/src/env.rs

@@ -344,18 +344,7 @@ impl EnvAppData {
             program: vec![],
         };
 
-        // change directory
+        apply_change_directory(&opts)?;
-        if let Some(d) = opts.running_directory {
-            match env::set_current_dir(d) {
-                Ok(()) => d,
-                Err(error) => {
-                    return Err(USimpleError::new(
-                        125,
-                        format!("cannot change directory to {}: {error}", d.quote()),
-                    ));
-                }
-            };
-        }
 
         let mut begin_prog_opts = false;
         if let Some(mut iter) = matches.get_many::<OsString>("vars") {
@@ -494,6 +483,21 @@ impl EnvAppData {
     }
 }
 
+fn apply_change_directory(opts: &Options<'_>) -> Result<(), Box<dyn UError>> {
+    if let Some(d) = opts.running_directory {
+        match env::set_current_dir(d) {
+            Ok(()) => d,
+            Err(error) => {
+                return Err(USimpleError::new(
+                    125,
+                    format!("cannot change directory to {}: {error}", d.quote()),
+                ));
+            }
+        };
+    }
+    Ok(())
+}
+
 fn apply_specified_env_vars(opts: &Options<'_>) {
     // set specified env vars
     for (name, val) in &opts.sets {