To optimize and improve the efficiency of the existing clean.py

[anupammaurya6767]

To make the script more efficient, here are some necessary changes:

1. Use a set instead of a list to store unique hashes. This will eliminate the need for sorting and dictionary manipulation later.

2. Instead of repeatedly finding characters in the line, use a single iteration to find the positions of important characters ('&', '=', 'n'). This will improve performance.

3. Use string methods startswith() and in to check for validity and paste errors. This avoids unnecessary string manipulations.

4. Instead of appending to the data list multiple times, create a temporary list to store the split lines, and then extend the data list with this temporary list. This reduces the number of list operations.

5. Replace the loop that removes symbols with a more efficient approach using the translate() method. This avoids iterating over each character individually.