feat: move time formatting in seperate function

src/builtins/time.rs

@@ -1,4 +1,4 @@
-use chrono::Local;
+use chrono::{DateTime, Local};
 
 use crate::error::ShellError;
 
@@ -10,17 +10,17 @@ impl Builtin for Time {
     fn execute(&mut self, _: &mut BuiltinConfig, args: Vec<String>) -> Result<(), ShellError> {
         let time = Local::now();
 
-        if args.is_empty() {
-            println!("{}", time.format("%T"));
-            return Ok(());
+        let formatting = args.get(0).cloned().unwrap_or_default();
+        let time_string = format_time(time, &formatting);
+        println!("{time_string}");
+        Ok(())
+    }
 }
 
-        let time_string = match args[0].as_str() {
+fn format_time(time: DateTime<Local>, formatting: &str) -> String {
+    match formatting {
         "RFC2822" => time.to_rfc2822(),
         "RFC3339" => time.to_rfc3339(),
         _ => time.format("%T").to_string(),
-        };
-        println!("{time_string}");
-        Ok(())
     }
 }