Unpad hex

How can unpad hex ...0020200030303 to ...0020200 ?

I am doing this:

```
let buffer = Buffer.from(paddedHex),
        bytes = new Uint8Array(buffer.length),
        i = buffer.length;

      while (i--) {
        bytes[i] = buffer[i];
      }

      Buffer.from(pkcs7.unpad(bytes)).toString('hex')
```