Chores/sorting refactoring

[Alexanderlacuna]

This pull request (PR) addresses two issues:

• Correctly handles sorting for floats involving NaN values fixing the error below

warning: `correlation_rust` (lib) generated 2 warnings (run `cargo fix --lib -p correlation_rust` to apply 1 suggestion)
    Finished `release` profile [optimized] target(s) in 3.36s_rust(bin)                                   
     Running `target/release/correlation_rust /tmp/correlation/37Q4IPvWda.json`
thread 'main' panicked at core/src/slice/sort/shared/smallsort.rs:860:5:
user-provided comparison function does not correctly implement a total order
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

• Refactors code to eliminate a double sorting bug

By implementing these changes, the PR ensures accurate sorting of floating-point numbers, including proper handling of NaN values, and enhances performance by removing redundant sorting operations.