Small fix and add toString for debugging

Common/src/main/java/com/almostreliable/unified/recipe/DuplicateLink.java

@@ -1,5 +1,6 @@
 package com.almostreliable.unified.recipe;
 
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.Objects;
 import java.util.Set;
@@ -13,19 +14,25 @@ public class DuplicateLink {
     }
 
     void updateMaster(RawRecipe master) {
-        4 = {DuplicateLink@28142}         Objects.requireNonNull(master);
+        Objects.requireNonNull(master);
         addDuplicate(master);
         this.currentMaster = master;
     }
 
     void addDuplicate(RawRecipe recipe) {
-        if(recipe == null) {
-            String s = "";
-        }
         recipes.add(recipe);
     }
 
     public RawRecipe getMaster() {
         return currentMaster;
     }
+
+    public Set<RawRecipe> getRecipes() {
+        return Collections.unmodifiableSet(recipes);
+    }
+
+    @Override
+    public String toString() {
+        return "Link{currentMaster=" + currentMaster + ", recipes=" + recipes.size() + "}";
+    }
 }

Common/src/main/java/com/almostreliable/unified/recipe/RawRecipe.java

@@ -17,7 +17,6 @@ public class RawRecipe {
     @Nullable private DuplicateLink duplicateLink;
     @Nullable private JsonObject transformedRecipe;
 
-
     public RawRecipe(ResourceLocation id, JsonObject originalRecipe) {
         this.id = id;
         this.originalRecipe = originalRecipe;
@@ -109,4 +108,11 @@ public class RawRecipe {
 
         return null;
     }
+
+    @Override
+    public String toString() {
+        String duplicate = duplicateLink != null ? " (duplicate)" : "";
+        String transformed = transformedRecipe != null ? " (transformed)" : "";
+        return String.format("['%s'] %s%s%s", type, id, duplicate, transformed);
+    }
 }

Common/src/main/java/com/almostreliable/unified/recipe/RecipeTransformer.java

@@ -54,6 +54,7 @@ public class RecipeTransformer {
                 }
             }
 
+            // TODO remove later
             List<DuplicateLink> duplicateLinks = rawRecipes
                     .stream()
                     .map(RawRecipe::getDuplicateLink)