How to create a seed from a 128 bit number?

Question

Java

the input is a string containing 128 bits;
the output must be a valid seed phrase. but the 12th word is not working for me. I suspect that the matter is in the hashing of the incoming string. But I don't know how to fix it. Help me please.

private String[] generateMnemonic2(String seedEntropy) { // на вход сид
    System.out.println(seedEntropy);
    String[] mnemonicWords = new String[12];

    for (int i = 0; i < 11; i++) {
      int mnemWord = Integer.parseInt(seedEntropy.substring(i * 11, i * 11 + 11), 2);
      mnemonicWords[i] = English.getWord(mnemWord);
    }
    mnemonicWords[11]=seedEntropy.substring(121,128);  //тут храню остаток временно
    
    String g=DigestUtils.sha256Hex(seedEntropy.getBytes()).substring(0,1);
    System.out.println(g);
    
    String v=mnemonicWords[11]+hexToBinary(g);
    System.out.println(v);
    
    BigInteger sha =new BigInteger(v,2);
    System.out.println(sha.toString());
    
    mnemonicWords[11] = English.getWord(sha.intValue());

    return mnemonicWords;
  }

  String hexToBinary(String hex) {
    int i = Integer.parseInt(hex, 16);
    String bin = Integer.toBinaryString(i);
    return bin;
  }

(the words are in the array, so I don’t write +1. The first 11 words are done correctly)

Many thanks in advance for your help