Null-terminate string to prevent garbage

src/pngv3.ts

@@ -280,7 +280,8 @@ const embedInRawDeflate = (b: Buffer, h: Buffer) => {
 };
 
 export const inject_data = async (container: File, injb: Buffer) => {
-    //injb = Buffer.from("https://take-me-to.space/6C1a6s5.pee");
+    // some badly encoded pngs can emit things after the last character, so we explicitely pad with a 0
+    injb = Buffer.concat([injb, Buffer.from([0])]);
 
     if (!csettings)
         throw new Error("Settings uninit");