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Here is code snippet, function transfer(address _to, uint _value, bytes memory _data, string memory _custom_fallback) public returns (bool success) { if(isContract(_to)) { if (balanceOf(msg.sender) < _value) revert(); balances[msg.sender] = safeSub(balanceOf(msg.sender), _value); balances[_to] = safeAdd(balanceOf(_to), _value); assert(_to.call.value(0)(bytes4(keccak256(_custom_fallback)), msg.sender, _value, _data)); emit Transfer(msg.sender, _to, _value, _data); return true; } else { return transferToAddress(_to, _value, _data); } } I am currently working with Solidity Version ^0.5.1 . What is the alternative and upgraded method to execute this assert function given below. And what is the main working of this assert() and their argu...