chore: restore original directory structure (project under code-review-graph-main/)

code-review-graph-main/tests/fixtures/sample.kt

@@ -0,0 +1,27 @@
+package com.example
+
+import java.util.UUID
+
+interface UserRepository {
+    fun findById(id: Int): User?
+    fun save(user: User)
+}
+
+data class User(val id: Int, val name: String, val email: String)
+
+class InMemoryRepo : UserRepository {
+    private val users = mutableMapOf<Int, User>()
+
+    override fun findById(id: Int): User? = users[id]
+
+    override fun save(user: User) {
+        users[user.id] = user
+        println("Saved user ${user.id}")
+    }
+}
+
+fun createUser(repo: UserRepository, name: String, email: String): User {
+    val user = User(1, name, email)
+    repo.save(user)
+    return user
+}