build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.5.21"
    repositories {
        google()
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.10'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        // <!-- might use implementation in Android Studio 3.0(Gradle 4.1) -->

    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
        maven {url 'https://oss.sonatype.org/content/repositories/snapshots/'

        }   

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}