Linux String Substitute (sed) task not accepted

Hi,
I have completed the task Linux String Substitute (sed) but the solution was not accepted. Could someone please review it? I checked each file according to the requirements before submitting the solution but still, it was not accepted. Link to the review:

@Tej-Singh-Rana could you please have a look? Thank you

Hi @haroon.gul9,
Please check the comment section.