input: Write a python function to find the maximum occurring character in a given string.
  assert maxCharFinder("worldwide") == 'w'
  assert maxCharFinder("programming") == 'g'
  assert maxCharFinder("mississippi") == 'i'
output: def maxCharFinder(s):
      from collections import Counter
      count = Counter(s)
      max_char = max(count, key=count.get)
      return max_char