function _depositETHForStaking(bytes calldata _blsPublicKeyOfKnot, uint256 _amount, bool _enableTransferHook) internal {
    require(_amount >= MIN_STAKING_AMOUNT, "Min amount not reached");
    require(_blsPublicKeyOfKnot.length == 48, "Invalid BLS public key");
    // LP token issued for the KNOT
    // will be zero for a new KNOT because the mapping doesn't exist
    LPToken lpToken = lpTokenForKnot[_blsPublicKeyOfKnot];
    if(address(lpToken) != address(0)) {
        // KNOT and it's LP token is already registered
        // mint the respective LP tokens for the user
        // total supply after minting the LP token must not exceed maximum staking amount per validator
        require(lpToken.totalSupply() + _amount <= maxStakingAmountPerValidator, "Amount exceeds the staking limit for the validator");
        // mint LP tokens for the depoistor with 1:1 ratio of LP tokens and ETH supplied
        lpToken.mint(msg.sender, _amount);
        emit LPTokenMinted(_blsPublicKeyOfKnot, address(lpToken), msg.sender, _amount);
    }
    else {
	
        // check that amount doesn't exceed max staking amount per validator
        require(_amount <= maxStakingAmountPerValidator, "Amount exceeds the staking limit for the validator");
    ...    
