Prevent multiple pokeball throws: add throwing guard flag and block at 0 pokeballs

index.html

@@ -7,7 +7,7 @@
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 <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
 <meta name="theme-color" content="#0a0520">
-<title>PokéSQL — Learn SQL</title>
+<title>PokéSQL — Lean SQL</title>
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 <link rel="stylesheet" href="style.css">
 </head>