A word nest is created by taking a starting word, and generating a new string by placing the word inside itself. This process is then repeated.
Nesting 3 times with the word "incredible":
start = incredible
first = incre|incredible|dible
second = increin|incredible|credibledible
third = increinincr|incredible|ediblecredibledible
The final nest is "increinincrincredibleediblecredibledible" (depth = 3).
Given a starting word and the final word nest, return the depth of the word nest.
word_nest("floor", "floor") ➞ 0
word_nest("code", "cocodccococodededeodeede") ➞ 5
word_nest("incredible", "increinincrincredibleediblecredibledible") ➞ 3
N/A