func_code: def search(string, letter):
      i = 0
      while i < len(string):
          if letter == string[i]:
              return 'True'
          elif letter != string[-1]:
              return 'False'
annotation: def search(string, letter):
      i = 0
      while i < len(string):
          if letter == string[i]:
              return True
          i += 1
      return False
  