https:
function _transfer(address _from, address _to, uint256 _amount) internal {
  SherXERC20Storage.Base storage sx20 = SherXERC20Storage.sx20();
  sx20.balances[_from] = sx20.balances[_from].sub(_amount);
  sx20.balances[_to] = sx20.balances[_to].add(_amount);
  emit Transfer(_from, _to, _amount);
}


function burn(address _from, uint256 _amount) internal {
  SherXERC20Storage.Base storage sx20 = SherXERC20Storage.sx20();
  sx20.balances[_from] = sx20.balances[_from].sub(_amount);
  sx20.totalSupply = sx20.totalSupply.sub(_amount);
  emit Transfer(_from, address(0), _amount);
}
        require(_to!= address(0), "Transfer to the zero address");
