/**
 * This function creates a username by concatenating the first letter of the first name with the last name in lowercase.
 *
 * Example:
 * createUsername("John", "Doe")
 * This returns "jdoe"
 *
 * createUsername("Alice", "Smith")
 * This returns "asmith"
 */
fun createUsername(firstName: String, lastName: String): String {

    val username = firstName[0].toLowerCase() + lastName.toLowerCase()
    return username
}
/**
 * This function creates a username by concatenating the first letter of the first name with the last name in lowercase.
 *
 * Example:
 * createUsername("John", "Doe")
 * This returns "jdoe"
 *
 * createUsername("Alice", "Smith")
 * This returns "asmith"
 */
fun createUsername(firstName: String, lastName: String): String {
/**
 * This function creates a username by concatenating the first letter of the first name with the last name in lowercase.
 *
 * Example:
 * createUsername("John", "Doe")
 * This returns "jdoe"
 *
 * createUsername("Alice", "Smith")
 * This returns "asmith"
 */
fun createUsername(firstName: String, lastName: String): String {

    val username = firstName[0].toLowerCase() + lastName.toLowerCase()
    return username
}