Create a method that splits any given String into an array of substrings called N-Grams with the length n. If the characters do not fill the last substring up to n, fill it up with '*'. code example

Example: extract n grams from text python

from nltk import ngrams

sentence = 'this is a foo bar sentences and i want to ngramize it'

n = 6
sixgrams = ngrams(sentence.split(), n)

for grams in sixgrams:
  print grams