Function percentage 

pub fn percentage(value: usize, total: usize) -> f64

Calculate percentage with proper rounding

Examples

use ipfrs_network::utils::percentage;

assert_eq!(percentage(25, 100), 25.0);
assert_eq!(percentage(1, 3), 33.33);
assert_eq!(percentage(0, 0), 0.0); // Handles division by zero