Optimize fold layout and ids

build.gradle

@@ -1,12 +1,14 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
+    ext.kotlin_version = '1.6.10'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:4.1.0"
-
+        classpath 'com.android.tools.build:gradle:7.0.4'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.10"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
@@ -15,8 +17,8 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
         mavenCentral()
+//        maven { url 'https://jitpack.io' }
     }
 }