胡斌

add test file for merge pure audio file

teacher:
uid_126041120_20210131235019961.txt
student:
uid_880302153_20210131235047920.txt
... ...
0.000 126041120_20210131235019934.aac create
3901.570 126041120_20210131235019934.aac close
... ...
0.000 880302153_20210131235047914.aac create
3819.160 880302153_20210131235047914.aac close
... ...