Can you explain the concept of Source Set in Kotlin Multiplatform and how it is used to organize code?

In Kotlin Multiplatform, Source Set is a logical group of source files combined by platform or common purpose. Source Set allows organizing code so that shared logic and platform-dependent code can be separated.

Main types of Source Set:

• commonMain — shared code for all platforms.
• commonTest — shared tests.
• platformMain (e.g., androidMain, iosMain) — code specific to a platform.
• platformTest — tests for a specific platform.

Using Source Set, most logic can be written once in commonMain, and platform-specific details can be implemented in platformMain. This simplifies maintenance and code reuse.

Example structure:

src/
  commonMain/
    kotlin/
      com/example/common/
  androidMain/
    kotlin/
      com/example/android/
  iosMain/
    kotlin/
      com/example/ios/

In build.gradle.kts, dependencies can be configured, and dependencies between Source Sets can be specified, allowing flexible management of code for different platforms.