Change IssuerPubKey constructor to be more functional

src/lib.rs

@@ -95,9 +95,8 @@ impl IssuerPubKey {
         X.push(&privkey.x0tilde * Atable + &privkey.x[0] * Btable);
 
         // The other elements (1 through n) are X[i] = x[i]*A
-        for i in 1..n_plus_one {
-            X.push(&privkey.x[i] * Atable);
-        }
+        X.extend(privkey.x.iter().skip(1).map(|xi| xi * Atable));
+
         IssuerPubKey { X }
     }
 }