Нормальная модульная структура

domain/build.gradle.kts

@@ -4,6 +4,11 @@ plugins {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+dependencies {
+    implementation(libs.kotlinx.coroutines.core)
 }