correct formatting bugs

src/prolog/io.rs

@@ -306,14 +306,16 @@ pub fn print(wam: &mut Machine, result: EvalSession) {
         EvalSession::InitialQuerySuccess(alloc_locs, mut heap_locs) => {
             print!("true");
 
+            if heap_locs.is_empty() {
                 if !wam.or_stack_is_empty() {
                     print!(" ");
                 }
 
                 println!(".");
 
-            if heap_locs.is_empty() {
                 return;
+            } else {
+                println!("");
             }
 
             loop {