Initial work on FFI

src/static_data/natures.rs

@@ -48,9 +48,9 @@ impl Nature {
     /// Calculates the modifier for a given stat. If it's the increased stat, returns the increased
     /// modifier, if it's the decreased stat, returns the decreased modifier. Otherwise returns 1.0
     pub fn get_stat_modifier(&self, stat: Statistic) -> f32 {
-        if stat == self.increase_stat {
+        if stat == self.increase_stat && stat != self.decrease_stat {
             self.increase_modifier
-        } else if stat == self.decrease_stat {
+        } else if stat == self.decrease_stat && stat != self.increase_stat {
             self.decrease_modifier
         } else {
             1.0