feat: subject of ReverseSecondHalf

subjects/reversesecondhalf/README.md

@@ -26,9 +26,9 @@ import (
 )
 
 func main() {
-    ReverseSecondHalf("This is the 1st half This is the 2nd half")
-    ReverseSecondHalf("")
-    ReverseSecondHalf("Hello World")
+    fmt.Print(ReverseSecondHalf("This is the 1st half This is the 2nd half"))
+    fmt.Print(ReverseSecondHalf(""))
+    fmt.Print(ReverseSecondHalf("Hello World"))
 }
 ```