replace ugly tos2(bytes) with string(bytes)

examples/VCasino/VCasino.v

@@ -144,4 +144,4 @@ fn main() {
         }
     }
     game_loop()
-}
+}

examples/log.v

@@ -9,4 +9,4 @@ fn main(){
     l.set_level(log.DEBUG)
     l.debug('debug')
     l.fatal('fatal')
-}
+}