[HELP] BUILD SCRIPTS OF MY GRADLE PROJECT

app-build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 26
    defaultConfig {
        applicationId "xyz.tech-frodo.dependencyTest"
        minSdkVersion 26
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        lintConfig file("lint.xml")
    }
}

dependencies {
    ... // 16 dependencies omitted
}
apply plugin: 'com.google.gms.google-services'

build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.3.21'
    ext.kotlin_coroutine_version = '1.1.1'
    repositories {
        google()
        jcenter()
        maven { url "https://plugins.gradle.org/m2/" }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.2'
        classpath 'com.google.gms:google-services:4.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.15.0'
        classpath 'com.github.ben-manes:gradle-versions-plugin:0.21.0'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven { url "http://dl.bintray.com/jetbrains/spek" }
    }

    apply plugin: 'com.github.ben-manes.versions'
    apply plugin: 'com.github.hierynomus.license'

    downloadLicenses {
        includeProjectDependencies = true
        dependencyConfiguration = 'compileClasspath'
        ext.apacheTwo = license('Apache License, Version 2.0', 'https://opensource.org/licenses/Apache-2.0')
        ext.bsd = license('BSD License', 'https://opensource.org/licenses/bsd-license')
        aliases = [
            (apacheTwo): [
                'The Apache Software License, Version 2.0',
                'Apache 2',
                'Apache License Version 2.0',
                'Apache License, Version 2.0',
                'Apache License 2.0',
                license('Apache License', 'https://www.apache.org/licenses/LICENSE-2.0')
            ],
            (bsd): [
                'BSD',
                license('New BSD License', 'https://opensource.org/licenses/bsd-license')
            ]
        ]
    }
}

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

subapp-build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 28

    defaultConfig {
        applicationId ""
        minSdkVersion 27
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    ... // 25 dependencies omitted
}