// First Hall Method
public int index = 0;
public List<string> texts = new List<string>() { "text1", "text2", "text3" };
void state_hall_1()
{
    if(index++ != texts.Count){
        index+=1;
     }
    currentText.text = texts[index];
    if (Input.GetKeyDown(KeyCode.Space))
    {
        if (index < texts.Count)
        {
            currentText.text = texts[index];
        }

    }
    if(index >= texts.Count){
             if (Input.GetKeyDown(KeyCode.C))
            {
                currentState = States.c_1;
            }
    }
}