Crea una función que reciba una palabra y la deletree, agregando letras consecutivamente hasta completar la palabra.
spelling("bee") ➞ ["b", "be", "bee"]
spelling("happy") ➞ ["h", "ha", "hap", "happ", "happy"]
spelling("eagerly") ➞ ["e", "ea", "eag", "eage", "eager", "eagerl", "eagerly"]N/A