Instantiating character at one spot at a time

Unity Engine
1

I have code that instantiates characters, but it instantiates them multiple times at one spot. So, I want to know a way to only make them instantiate only once.
Any help would be appreciated. Thanks.

	void Generate()
	{
		if(cooldown==0)
		{
			for(int j = 0; j < targets.Length;j++)
			{
				for(int i = 0; i < apartments.Length; i++)
				{
					j = Random.Range(0,targets.Length);
					i = Random.Range(0,apartments.Length);
					
					if(!targets[j]||!apartments[i])
						return;
					
					if(!instantiated){
						Instantiate(targets[j],apartments[i].transform.position, Quaternion.identity);
						instantiated = true;
						cooldown = timeInterval;
					
					}
										
				}
			}
		}
		else
		{
			instantiated = false;
		}
		
	}
2

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