Resolve warnings.

examples/brute_force.rs

@@ -42,19 +42,20 @@ fn main() {
 
     let mut b = args.problem.get_problem();
 
-    println!("{b}");
+    b.print();
 
     match args.mode {
         Mode::Solutions => {
             while b.next_finish_state() {
-                println!("{}\n{}\n{}\n{}", b.count(), b.solution_count(), b.cost(), b);
+                println!("{}\n{}\n{}", b.count(), b.solution_count(), b.cost());
+                b.print();
             }
 
             println!("Solutions: {}\nStates: {}", b.solution_count(), b.count());
         }
         Mode::Step => {
             while b.next_state() {
-                println!("{}", b);
+                b.print();
                 let mut s = String::new();
                 let _ = io::stdin().read_line(&mut s);
             }