add defense attribute to player and monster

macros/src/lib.rs

@@ -24,6 +24,7 @@ pub fn create_monsters(input: TokenStream) -> TokenStream {
             experience_gain: usize,
             ticks_between_steps: u128,
             damage_range: RangeInclusive<usize>,
+            defense: usize,
         }
         impl Monster for #variant_name {
             fn get_name(&self) -> &str { &self.name }
@@ -35,7 +36,7 @@ pub fn create_monsters(input: TokenStream) -> TokenStream {
             }
             fn get_ticks_between_steps(&self) -> u128 { self.ticks_between_steps }
             fn damage(&self) -> usize { rand::thread_rng().gen_range(self.damage_range.clone()) }
-
+            fn defense(&self) -> usize { self.defense }
             #[cfg(test)]
             fn get_life(&self) -> usize { self.life }
         }