为什么Kotlin不打印我从.txt文件中选择的字符串，除非它是最后一行？

import java.io.File

fun main() {
    val file = File("path/to/your/file.txt")
    val reader = file.bufferedReader()

    var line: String?
    while (reader.readLine().also { line = it } != null) {
        // 处理每一行的内容，例如打印
        println(line)
    }

    reader.close()
}

import java.io.File

fun main() {
    val file = File("path/to/your/file.txt")
    val reader = file.bufferedReader()

    var line: String?
    while (reader.readLine().also { line = it } != null) {
        // 去除换行符和空白字符
        val trimmedLine = line?.trim()
        // 处理每一行的内容，例如打印
        println(trimmedLine)
    }

    reader.close()
}