Multiple files problem

[Ibrar-Hussain]

According to you, If three files are given in input folder, It should give the text that is identical in three files. And it is actually doing that. But it is also highlighting random text on random bases in the three files .
Run you application on 1.txt, 2.txt and 4 .txt in the given link to see the issue.

link: https://drive.google.com/drive/folders/1_lprWRlHnbo70zqgk_JJvhRQk38kxpfA?usp=sharing