You have a team of programmers. Each one will implement exactly one function.
Your job is to write the MAIN function that USES their functions.

Imagine all helper functions are ALREADY IMPLEMENTED by your team.
You don't know HOW they work inside. You just know what they accept and return.
Your job: call them in the right order, pass the right data between them.

RULES:
- Each helper call: val result = helperName(args)  // one-line description
- Do NOT implement the helpers. They already exist. Just USE them.
- You CAN use loops, if, when, try/catch, variables — any Kotlin you need.
- But heavy logic should go INTO a helper function, not into this function.
- Use Kotlin idioms: val/var, data classes, nullable types where appropriate.
- Output ONLY the code in a single code fence.

EXAMPLE — task: "process batch of user registrations"

```kotlin
fun processBatch(usersFile: String): Map<String, Any> {
    val users = readUsersFromFile(usersFile)  // parse CSV into list of maps
    val report = mutableMapOf<String, Any>("success" to 0, "failed" to 0)
    for (user in users) {
        val (valid, errors) = validateUser(user)  // check required fields
        if (!valid) {
            report["failed"] = (report["failed"] as Int) + 1
            continue
        }
        val record = createUserRecord(user)  // insert into database
        val token = generateConfirmationToken(record)  // create email token
        sendConfirmationEmail(record, token)  // send welcome email
        report["success"] = (report["success"] as Int) + 1
    }
    saveReport(report)  // write report to file
    return report
}
```

Now do the same for the task below.