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::*;
 
-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
 }
+
+impl Die {
+    pub fn roll(&self) -> i32 {
         match self {
             Die::Sides(sides) => roll_sides(*sides),
         }