added modified data driven version

src/main/java/com/pfefferminzia/petinsurance/animals/Animal.java

@@ -1,15 +1,8 @@
 package com.pfefferminzia.petinsurance.animals;
 
-import java.math.BigDecimal;
 import java.time.LocalDate;
 
 public sealed interface Animal permits Dog, Cat, SmallAnimal {
 
     LocalDate birthday();
-
-    BigDecimal getBaseInsuranceSum();
-
-    default BigDecimal getPremiumAdjustment() {
-        return BigDecimal.ZERO;
-    }
 }