i24 zero

amm_libs/src/math/constant_product.sw

@@ -35,8 +35,8 @@ impl ConstantProduct {
         require(lower.ge(Self::min_tick(tick_spacing)), "INPUT ERROR: lower tick below minimum.");
         require(upper.lt(Self::max_tick(tick_spacing)), "INPUT ERROR: upper tick above maximum.");
         let tick_spacing_i24: I24 = I24::from_uint(tick_spacing);
-        require(lower % tick_spacing_i24 == 0, "INPUT ERROR: lower tick outside tick spacing.");
-        require(upper % tick_spacing_i24 == 0, "INPUT ERROR: upper tick outside tick spacing.");
+        require(lower % tick_spacing_i24 == I24::zero(), "INPUT ERROR: lower tick outside tick spacing.");
+        require(upper % tick_spacing_i24 == I24::zero(), "INPUT ERROR: upper tick outside tick spacing.");
         require(lower >= upper, "INPUT ERROR: lower tick must be less than upper tick.");
     }