use () for function invocations and use = for property assignments

app/build.gradle

@@ -1,35 +1,36 @@
-apply plugin: "com.android.application"
+apply(plugin: "com.android.application")
 
-apply plugin: "kotlin-android"
+apply(plugin: "kotlin-android")
 
-apply plugin: "kotlin-android-extensions"
+apply(plugin: "kotlin-android-extensions")
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.2"
+    compileSdkVersion = 29
+    buildToolsVersion = "29.0.2"
     defaultConfig {
-        applicationId "com.ddmeng.kotlindslsample"
-        minSdkVersion 21
-        targetSdkVersion 29
-        versionCode 1
-        versionName "1.0"
-        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        applicationId = "com.ddmeng.kotlindslsample"
+        minSdkVersion(21)
+        targetSdkVersion(29)
+        versionCode = 1
+        versionName = "1.0"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro"
+            minifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"),
+                    "proguard-rules.pro")
         }
     }
 }
 
 dependencies {
-    implementation fileTree(dir: "libs", include: ["*.jar"])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation "androidx.appcompat:appcompat:1.1.0"
-    implementation "androidx.core:core-ktx:1.0.2"
-    implementation "androidx.constraintlayout:constraintlayout:1.1.3"
-    testImplementation "junit:junit:4.12"
-    androidTestImplementation "androidx.test.ext:junit:1.1.0"
-    androidTestImplementation "androidx.test.espresso:espresso-core:3.1.1"
+    implementation(fileTree(dir: "libs", include: ["*.jar"]))
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version")
+    implementation("androidx.appcompat:appcompat:1.1.0")
+    implementation("androidx.core:core-ktx:1.0.2")
+    implementation("androidx.constraintlayout:constraintlayout:1.1.3")
+    testImplementation("junit:junit:4.12")
+    androidTestImplementation("androidx.test.ext:junit:1.1.0")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.1.1")
 }

build.gradle

@@ -5,11 +5,11 @@ buildscript {
     repositories {
         google()
         jcenter()
-        
+
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:3.5.3"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath("com.android.tools.build:gradle:3.5.3")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version")
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
@@ -19,10 +19,10 @@ allprojects {
     repositories {
         google()
         jcenter()
-        
+
     }
 }
 
 task clean(type: Delete) {
-    delete rootProject.buildDir
+    delete(rootProject.buildDir)
 }

settings.gradle

@@ -1,2 +1,2 @@
-include ":app"
-rootProject.name="KotlinDSLSample"
+include(":app")
+rootProject.name = "KotlinDSLSample"