Move println out of the loop

src/main.rs

@@ -127,9 +127,9 @@ fn output_energy(bodies: &mut [Body; BODIES_COUNT]) {
                         + sqr(body.position[2] - body2.position[2]),
                 );
         }
+    }
 
     println!("{:.9}", energy);
-    }
 }
 
 /// Steps the simulation foward by one time step