How do i copy text programmatically in Android using kotlin code?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="70dp"
        android:text="Copy Text Programmatically"
        android:textAlignment="center"
        android:textColor="@color/teal_700"
        android:textSize="32sp"
        android:textStyle="bold" />
    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:hint="Enter your text" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:onClick="copyText"
        android:text="Copy text" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:onClick="pasteText"
        android:text="Paste text" />
    <TextView
        android:textColor="@color/red"
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:textSize="24sp"
        android:textStyle="bold" />
</LinearLayout>

package com.rrtutors.kotlincource
import android.content.ClipData
import android.content.ClipboardManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.content.Context
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast

class CopyTextActivity : AppCompatActivity() {
    lateinit var editText: EditText
    lateinit var textView: TextView
    lateinit var clipboardManager: ClipboardManager
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_copy_text)
        title = "KotlinApp"
        editText = findViewById(R.id.editText)
        textView = findViewById(R.id.textView)
    }

    fun copyText(view: View) {
        val text = editText.text.toString()
        if (text.isNotEmpty()) {
            clipboardManager = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
            val clipData = ClipData.newPlainText("key", text)
            clipboardManager.setPrimaryClip(clipData)
            Toast.makeText(applicationContext, "Copied", Toast.LENGTH_SHORT).show()
        } else {
            Toast.makeText(applicationContext, "No text to be copied", Toast.LENGTH_SHORT).show()
        }
    }
    fun pasteText(view: View) {
        val clipData: ClipData = clipboardManager.primaryClip!!
        val item: ClipData.Item = clipData.getItemAt(0)
        textView.text = item.text.toString()
        Toast.makeText(applicationContext, "Text is being Pasted", Toast.LENGTH_SHORT).show()

    }
}