Working on History struct. First test is passing.

src/game.rs

@@ -73,7 +73,7 @@ impl Game {
         }
 
         let r = &self.result;
-        let o = sortperm(r);
+        let o = utils::sortperm(r);
 
         let t = (0..self.teams.len())
             .map(|e| TeamVariable {
@@ -272,23 +272,12 @@ impl Game {
     }
 }
 
-fn sortperm(xs: &[u16]) -> Vec<usize> {
-    let mut x = xs.iter().enumerate().collect::<Vec<_>>();
-    x.sort_unstable_by_key(|(_, x)| Reverse(*x));
-    x.into_iter().map(|(i, _)| i).collect()
-}
-
 #[cfg(test)]
 mod tests {
     use crate::{Gaussian, Player, GAMMA, N_INF};
 
     use super::*;
 
-    #[test]
-    fn test_sortperm() {
-        assert_eq!(sortperm(&[0, 1, 2, 0]), vec![2, 1, 0, 3]);
-    }
-
     #[test]
     fn test_1vs1() {
         let t_a = Player::new(