feat: print resultant land after execution

src/bin/ponderosa-cpu.rs

@@ -214,5 +214,14 @@ fn main() -> io::Result<()> {
         dbg!(tree.trunk);
     }
 
+    println!("Resulting World\n=====");
+
+    for col_idx in 0..land.width {
+        for row_idx in 0..land.height {
+            print!("{}\t", land.map.get(&(col_idx, row_idx)).unwrap_or(&0u16));
+        }
+        println!();
+    }
+
     Ok(())
 }