Error while compiling

so.....do i just add this to the json file? as it is? or does it go in the cs file? i'm a little confused. can anyone post a copy of which ever file it goes in so i can see where it goes? 

NEW 1525
            {
                foreach (var heli in _PatrolHelicopters)
                {
                    var ai = heli?.GetComponent<PatrolHelicopterAI>() ?? null;
                    if (ai != null) StartStrafe(ai, target, ai.CanUseNapalm());
                }
            }
            else StartStrafe(HeliInstance, target, HeliInstance.CanUseNapalm());
            player.Message(string.Format(GetMessage("strafingOtherPosition", player.Id), target.displayName));
        }
NEW 1926
        private void StartStrafe(PatrolHelicopterAI heli, BasePlayer target, bool useNapalm)
        {
            if (heli == null || !(heli?.IsAlive() ?? false) || (heli?._currentState ?? PatrolHelicopterAI.aiState.DEATH) == PatrolHelicopterAI.aiState.DEATH || target == null) return;
            heli.interestZoneOrigin = target.transform.position;
            heli.ExitCurrentState();
            heli.State_Strafe_Enter(target, useNapalm);
        }​

Of course you have to paste it in the plugin .cs file. You see that this no .cfg code. But do it exactly! One false bracket and it´s messed up.