fix bug in show

src/core.rs

@@ -170,11 +170,16 @@ impl Pacdef {
     }
 
     fn show_group_content(&self, groups: &ArgMatches) -> Result<()> {
-        let groups = groups.get_many::<String>("group").unwrap();
-        for arg_group in groups {
+        let mut iter = groups.get_many::<String>("group").unwrap().peekable();
+
+        while let Some(arg_group) = iter.next() {
             let group = self.groups.iter().find(|g| g.name == *arg_group).unwrap();
             println!("{group}");
+            if iter.peek().is_some() {
+                println!();
+            }
         }
+
         Ok(())
     }