Code Rewrite

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using GTA;
using GTA.Native;

namespace TrackersV
{
    public class TrackersV : Script
    {
        List<Entity> entityList = new List<Entity>();
        List<Entity> allEntityList = new List<Entity>();
        List<Blip> blipList = new List<Blip>();
        public TrackersV()
        {
            KeyDown += OnKeyDown;
            Tick += TrackersV_Tick;
        }

        private void addBlips()
        {
            foreach (Entity trackedEntity in allEntityList)
            {
                BlipColor blipColor;
                if (Game.Player.Character.Model == PedHash.Michael)
                {
                    blipColor = BlipColor.Michael;
                }
                else if (Game.Player.Character.Model == PedHash.Franklin)
                {
                    blipColor = BlipColor.Franklin;
                }
                else if (Game.Player.Character.Model == PedHash.Trevor)
                {
                    blipColor = BlipColor.Trevor;
                }
                else
                {
                    blipColor = BlipColor.Freemode;
                }

                List<GTA.Math.Vector3> blipPositions = new List<GTA.Math.Vector3>();
                foreach (Blip blip in World.GetActiveBlips())
                {
                    blipPositions.Add(blip.Position);
                }
                if (trackedEntity.Exists() && !trackedEntity.CurrentBlip.Exists() && entityList.Contains(trackedEntity))
                {
                    Blip newBlip = trackedEntity.AddBlip();
                    newBlip.Color = blipColor;
                    newBlip.Name = trackedEntity.Model.ToString();
                    newBlip.IsShortRange = false;
                    newBlip.IsFlashing = true;
                    newBlip.ShowRoute = true;
                    newBlip.Scale = 1;

                } else if (trackedEntity.CurrentBlip.Exists() && !entityList.Contains(trackedEntity))
                {
                    trackedEntity.CurrentBlip.Remove();
                }


            }
        }

        private void TrackersV_Tick(object sender, EventArgs e)
        {
            addBlips();
        }

        private void OnKeyDown(object source, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.J)
            {
                AddEntity();
            }
        }

        private void AddEntity()
        {
            Entity Target = Game.Player.GetTargetedEntity();
            if (Target != null && Target.Exists())
            {
                if (!entityList.Contains(Target))
                {
                    entityList.Add(Target);
                    allEntityList.Add(Target);
                } else
                {
                    entityList.Remove(Target);
                }
            }
        }
    }
}