Refactor file loading to improve efficiency

[krishnatejavedula]

This commit refactors the code to load data from the file only once instead of multiple times. Instead of calling three times to extract different columns, the code now loads the file once and extracts all necessary columns from the loaded data array. This change improves code efficiency by reducing redundant file reads.

Changes made:

• Load file data only once using .
• Extract necessary columns from the loaded data array.

Closes issue #158

[israelmcmc]

I changed the base branch, from main to develop. This is a recent change of workflow. After that, I'm seeing an issue with the commit to be merged, so I'm going to close and reopen this to see if that fixes it.

[israelmcmc]

It seems that worked.