修复歌词原文和译文交错排列时会出现不对应的问题

lts_test.go

@@ -0,0 +1,25 @@
+package main
+
+import "testing"
+
+func BenchmarkSRTContent_String(b *testing.B) {
+	srt := SRTContent{
+		Index: 10,
+		Start: 100,
+		End:   200,
+		Text:  "言语 不起作用,想看到 具体行动",
+	}
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = srt.String()
+	}
+}
+
+func BenchmarkLrc2Srt(b *testing.B) {
+	id := "28891491"
+	lyric, lyricT := Get163Lyric(id)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, _ = Lrc2Srt(lyric), Lrc2Srt(lyricT)
+	}
+}