Solution I lost my password

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"encoding/hex"
	"fmt"
)

func main() {
	encKey, err := hex.DecodeString("4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b")
	// Appropriate null iv as 0 ^ a = a
	iv, err := hex.DecodeString("00000000000000000000000000000000")
	ciphertext, err := base64.StdEncoding.DecodeString("PCXrmCkYWyRRx3bf+zqEydW9/trbFToMDx6fAvmeCDw=")
	if err != nil {
		panic(err)
	}

	block, err := aes.NewCipher([]byte(encKey))
	if err != nil {
		panic(err)
	}

	if len(ciphertext)%aes.BlockSize != 0 {
		panic("ciphertext is not a multiple of the block size")
	}

	mode := cipher.NewCBCDecrypter(block, []byte(iv))
	mode.CryptBlocks(ciphertext, ciphertext)

	fmt.Printf("%s\n", ciphertext)
}