String -> N iterations -> String created by dubirajara1 - https://repl.it/@dubirajara1/String-greater-N-iterations-greater-String

string_n_string.py

from itertools import chain

def string_n_string(s, n):
  for _ in range(n):
    even = (char for i, char in enumerate(s) if i % 2 == 0)
    odd = (char for i, char in enumerate(s) if i % 2 != 0)
    s = ''.join(chain(even , odd))
  
  return s

assert string_n_string("Wow Example!", 1) == "WwEapeo xml!" # testcase
assert string_n_string("qwertyuio", 2) == "qtorieuwy" # testcase