chore: move fn roll_sides outside of main method fn

01.workspace/oxidice_lib/src/imp/die_roll.rs

@@ -1,11 +1,12 @@
 use crate::*;
 
+fn roll_sides(sides: u16) -> i32 {
+    let mut rng = rand::rng();
+    rng.random_range(1..=sides) as i32
+}
+
 impl Die {
     pub fn roll(&self) -> i32 {
-        fn roll_sides(sides: u16) -> i32 {
-            let mut rng = rand::rng();
-            rng.random_range(1..=sides) as i32
-        }
         match self {
             Die::Sides(sides) => roll_sides(*sides),
         }