Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

80_Slots/java/src/SlotsGame.java

@@ -0,0 +1,6 @@
+public class SlotsGame {
+    public static void main(String[] args) {
+        Slots slots = new Slots();
+        slots.play();
+    }
+}