input: Write a python function to search for a phrase in a string.
  assert search("to be or not to be", "Whether 'tis nobler in the mind to suffer") == False
  assert search("nobler", "Whether 'tis nobler in the mind to suffer") == True
  assert search("mind", "Whether 'tis nobler in the mind to suffer") == True
output: def search(phrase, string):
      return phrase in string