Player is not looking at correct direction

Question

My Enemy/Bot is facing the wrong direction as shown in the attached screenshot 1.
Basically what I want is that Enemy/Bot gun should directly face the player, not enemy/Bot himself.

Note: White line in the image is representing Aim direction which is
correct.

Here is my Code:
Vector3 targetPosition = kbcrd.playerToEngage.thirdPersonPlayerModel.shootTarget.position;
targetPosition .y = 0;

Vector3 botPosition = pb.thirdPersonPlayerModel.gunDirection.position;
botPosition.y = 0;

Quaternion targetRotation = Quaternion.LookRotation(targetPosition - botPosition);

//pb is Bot which is holding transform and other scripts.
pb.transform.rotation = Quaternion.RotateTowards(pb.transform.rotation, targetRotation, kbcrd.lookingInputSmooth);

What I Get from the above code is this: (Screenshot # 1)

What I want is this: (Screenshot # 2)

Guns And player Orientation:

Full function if needed:
public override void WriteToPlayerInput(Kit_PlayerBehaviour pb)
{
    CampaignModeControlRuntimeData kbcrd = pb.botControlsRuntimeData as CampaignModeControlRuntimeData;
    CampaignModeEnemyAI botCampaignModeAI = pb.gameObject.GetComponent<CampaignModeEnemyAI>();

if (botCampaignModeAI.enemyInRange)
    {
        if (kbcrd.enemyPlayersAwareOff.Contains(botCampaignModeAI.detectedEnemies) == false)
        {
            kbcrd.enemyPlayersAwareOff.Add(botCampaignModeAI.detectedEnemies);
        }

kbcrd.playerToEngage = botCampaignModeAI.detectedEnemies;
        //CheckForEnemies(pb, kbcrd);
    }
    else
    {
        kbcrd.playerToEngage = null;
    }

UpdateAimPosition(pb, kbcrd);
    FiringDecision(pb, kbcrd, botCampaignModeAI.enemyInSight);
 }

Any help is appreciated. I know its simple problem but I struggling now. :(

Swati · Answer

Thanks to @derhugo for answering this on Stack overflow Link to Answar
So the problem was basically the offset distance between the gun and the bot. So the Code mentioned in the question was just rotating Bot toward the player while not including the offset between the gun and bot. Here is the final code:
var targetPosition = kbcrd.playerToEngage.thirdPersonPlayerModel.shootTarget.position;
targetPosition.y = 0f;

var botPosition = pb.thirdPersonPlayerModel.gunDirection.position;
botPosition.y = 0f;

var gunForward = gunDirection.forward;
gunForward.y = 0f;

var botForward = pb.transform.forward;
botForward.y = 0f;

// Get the offset between the bot's and the gun's forward vectors
var gunBotOffset = Vector3.SignedAngle(gunForward, botForward, Vector3.up);
// Get a rotation to rotate back from the gun to the player direction
var gunToBotRotation = Quaternion.AngleAxis(gunBotOffset, Vector3.up);

// Add the back rotation to the target rotation
var targetRotation = Quaternion.LookRotation(targetPosition - botPosition) * gunToBotRotation;

pb.transform.rotation = Quaternion.RotateTowards(pb.transform.rotation, targetRotation, kbcrd.lookingInputSmooth);

Note: Mentioned code is the copy of the "@derhugo" code from stack overflow.

Adrien G. · Answer

Check this link.
In your case, it would be, I think:
Vector3 targetPosition = kbcrd.playerToEngage.thirdPersonPlayerModel.shootTarget.position;
targetPosition .y = 0;

Vector3 botPosition = pb.thirdPersonPlayerModel.gunDirection.position;
botPosition.y = 0;

Vector3 targetDirection = targetPosition - botPosition;

float singleStep = speed * Time.deltaTime;
Vector3 newDirection = Vector3.RotateTowards(transform.forward, targetPosition, singleStep, 0.0f);

pb.transform.rotation = Quaternion.LookRotation(newDirection);

I hope it works, I didn't try it :)
EDIT 1: This assume that you put this code in the update function

Player is not looking at correct direction

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