added specieskey to make class reflection in Calculations.class stronger

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

@@ -5,4 +5,6 @@ import java.time.LocalDate;
 public sealed interface Animal permits Dog, Cat, SmallAnimal {
 
     LocalDate birthday();
+
+    String speciesKey();
 }

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

@@ -3,4 +3,9 @@ package com.pfefferminzia.petinsurance.animals;
 import java.time.LocalDate;
 
 public final record Cat(LocalDate birthday) implements Animal {
+
+    @Override
+    public String speciesKey() {
+        return "CAT";
+    }
 }

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

@@ -5,7 +5,7 @@ import java.time.LocalDate;
 public final record Dog(LocalDate birthday, String breed) implements Animal {
 
     @Override
-    public String breed() {
-        return (this.breed == null || this.breed.isBlank()) ? "" : this.breed;
+    public String speciesKey() {
+        return "DOG";
     }
 }

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

@@ -3,4 +3,9 @@ package com.pfefferminzia.petinsurance.animals;
 import java.time.LocalDate;
 
 public final record SmallAnimal(LocalDate birthday) implements Animal {
+
+    @Override
+    public String speciesKey() {
+        return "SMALLANIMAL";
+    }
 }