diff --git a/app/build.gradle b/app/build.gradle
index 5100b95a6..a86852062 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -29,6 +29,7 @@ android {
     buildFeatures {
         viewBinding true
     }
+    namespace 'ru.yandex.practicum.contacts'
 }
 
 dependencies {
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5f2186e36..a8137e4e3 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="ru.yandex.practicum.contacts">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.READ_CONTACTS" />
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java
new file mode 100644
index 000000000..c4af97eef
--- /dev/null
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/BaseListDiffCallback.java
@@ -0,0 +1,25 @@
+package ru.yandex.practicum.contacts.presentation.base;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.DiffUtil;
+
+public class BaseListDiffCallback<T extends ListDiffInterface<T>> extends DiffUtil.ItemCallback<T>{
+
+
+    @Override
+    public boolean areItemsTheSame(@NonNull T oldItem, @NonNull T newItem) {
+        return oldItem.theSameAs(newItem);
+    }
+
+    @Override
+    public boolean areContentsTheSame(@NonNull T oldItem, @NonNull T newItem) {
+        return oldItem.equals(newItem);
+    }
+
+    @Nullable
+    @Override
+    public Object getChangePayload(@NonNull T oldItem, @NonNull T newItem) {
+        return newItem;
+    }
+}
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java
new file mode 100644
index 000000000..ad0233f36
--- /dev/null
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/base/ListDiffInterface.java
@@ -0,0 +1,6 @@
+package ru.yandex.practicum.contacts.presentation.base;
+
+public interface ListDiffInterface<T>{
+    boolean theSameAs(T t);
+    boolean equals(Object o);
+}
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
index 4203bc297..42049a5a7 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/FilterContactTypeAdapter.java
@@ -17,6 +17,7 @@
 
 import ru.yandex.practicum.contacts.databinding.ItemFilterBinding;
 import ru.yandex.practicum.contacts.model.ContactType;
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 import ru.yandex.practicum.contacts.presentation.filter.model.FilterContactType;
 import ru.yandex.practicum.contacts.presentation.filter.model.FilterContactTypeUi;
 import ru.yandex.practicum.contacts.utils.model.ContactTypeUtils;
@@ -26,7 +27,7 @@ public class FilterContactTypeAdapter extends RecyclerView.Adapter<FilterContact
 
     private final AsyncListDiffer<FilterContactTypeUi> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new BaseListDiffCallback<FilterContactTypeUi>()).build()
     );
 
     private final Consumer<FilterContactTypeUi> clickListener;
@@ -85,23 +86,4 @@ public void bind(FilterContactTypeUi data) {
             }
         }
     }
-
-    static class ListDiffCallback extends DiffUtil.ItemCallback<FilterContactTypeUi> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return oldItem.getContactType() == newItem.getContactType();
-        }
-
-        @Override
-        public boolean areContentsTheSame(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return oldItem.equals(newItem);
-        }
-
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull FilterContactTypeUi oldItem, @NonNull FilterContactTypeUi newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
index fbb187fdf..ca2a6f27f 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/filter/model/FilterContactTypeUi.java
@@ -2,7 +2,10 @@
 
 import androidx.annotation.NonNull;
 
-public class FilterContactTypeUi {
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
+import ru.yandex.practicum.contacts.presentation.main.ContactUi;
+
+public class FilterContactTypeUi implements ListDiffInterface<FilterContactTypeUi> {
 
     private final FilterContactType contactType;
     private final boolean selected;
@@ -20,6 +23,11 @@ public boolean isSelected() {
         return selected;
     }
 
+    @Override
+    public boolean theSameAs(FilterContactTypeUi filterContactTypeUi) {
+        return this.getContactType() == filterContactTypeUi.getContactType();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
index 9c2317248..e075245a1 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactAdapter.java
@@ -23,12 +23,13 @@
 
 import ru.yandex.practicum.contacts.R;
 import ru.yandex.practicum.contacts.databinding.ItemContactBinding;
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 
 public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ViewHolder> {
 
     private final AsyncListDiffer<ContactUi> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new BaseListDiffCallback<ContactUi>()).build()
     );
 
     @NonNull
@@ -92,23 +93,4 @@ private void loadAvatar(ContactUi contact) {
                     .into(binding.contactPhoto);
         }
     }
-
-    static class ListDiffCallback extends DiffUtil.ItemCallback<ContactUi> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return oldItem.hashCode() == newItem.hashCode();
-        }
-
-        @Override
-        public boolean areContentsTheSame(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return oldItem.equals(newItem);
-        }
-
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull ContactUi oldItem, @NonNull ContactUi newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
index 4b2f216e8..e84f49396 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/main/ContactUi.java
@@ -5,8 +5,10 @@
 import java.util.List;
 
 import ru.yandex.practicum.contacts.model.ContactType;
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
+import ru.yandex.practicum.contacts.presentation.sort.SortTypeUI;
 
-public class ContactUi {
+public class ContactUi implements ListDiffInterface<ContactUi> {
 
     private final String name;
     private final String phone;
@@ -41,6 +43,11 @@ public List<ContactType> getTypes() {
         return types;
     }
 
+    @Override
+    public boolean theSameAs(ContactUi contactUi) {
+        return this.hashCode() == contactUi.hashCode();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
index fde5f59c8..2797a9fe0 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeAdapter.java
@@ -17,13 +17,14 @@
 
 import ru.yandex.practicum.contacts.R;
 import ru.yandex.practicum.contacts.databinding.ItemSortBinding;
+import ru.yandex.practicum.contacts.presentation.base.BaseListDiffCallback;
 import ru.yandex.practicum.contacts.presentation.sort.model.SortType;
 
 public class SortTypeAdapter extends RecyclerView.Adapter<SortTypeAdapter.ViewHolder> {
 
     private final AsyncListDiffer<SortTypeUI> differ = new AsyncListDiffer<>(
             new AdapterListUpdateCallback(this),
-            new AsyncDifferConfig.Builder<>(new ListDiffCallback()).build()
+            new AsyncDifferConfig.Builder<>(new BaseListDiffCallback<SortTypeUI>()).build()
     );
 
     private final Consumer<SortTypeUI> clickListener;
@@ -88,23 +89,4 @@ private int resource(SortType sortType) {
             }
         }
     }
-
-    static class ListDiffCallback extends DiffUtil.ItemCallback<SortTypeUI> {
-
-        @Override
-        public boolean areItemsTheSame(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return oldItem.getSortType() == newItem.getSortType();
-        }
-
-        @Override
-        public boolean areContentsTheSame(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return oldItem.equals(newItem);
-        }
-
-        @Nullable
-        @Override
-        public Object getChangePayload(@NonNull SortTypeUI oldItem, @NonNull SortTypeUI newItem) {
-            return newItem;
-        }
-    }
 }
diff --git a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
index eb71f27cd..4fbee9dc9 100644
--- a/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
+++ b/app/src/main/java/ru/yandex/practicum/contacts/presentation/sort/SortTypeUI.java
@@ -2,9 +2,10 @@
 
 import androidx.annotation.NonNull;
 
+import ru.yandex.practicum.contacts.presentation.base.ListDiffInterface;
 import ru.yandex.practicum.contacts.presentation.sort.model.SortType;
 
-public class SortTypeUI {
+public class SortTypeUI implements ListDiffInterface<SortTypeUI> {
 
     private final SortType sortType;
     private final boolean selected;
@@ -22,6 +23,11 @@ public boolean isSelected() {
         return selected;
     }
 
+    @Override
+    public boolean theSameAs(SortTypeUI sortTypeUI) {
+        return this.getSortType() == sortTypeUI.getSortType();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
diff --git a/build.gradle b/build.gradle
index f5cff798e..2290e642a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '7.1.3' apply false
-    id 'com.android.library' version '7.1.3' apply false
+    id 'com.android.application' version '7.3.1' apply false
+    id 'com.android.library' version '7.3.1' apply false
     id 'org.jetbrains.kotlin.android' version '1.6.21' apply false
 }
 
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index ffc1ff25e..0894265f9 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 #Tue Apr 26 22:12:06 CEST 2022
 distributionBase=GRADLE_USER_HOME
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME