isValidMnemonic function
Implementation
bool isValidMnemonic(String mnemonic, {bool verifyChecksum = true}) {
final words = mnemonic.split(' ');
// allow 12 / 24 words mnemonics
return (words.length == 12 || words.length == 24) &&
words.every((word) => isValidMnemonicWord(word)) &&
(verifyChecksum ? bip39.validateMnemonic(mnemonic) : true);
}