corrected an critical bug

[roshankraveendrababu]

Description

changes prods[i] to arr[i] in the left subarray . so that the temp variables value are correctly found out

Fixes # (issue)

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project i.e. Pep8
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have squashed unnecessary commits