input: Write a function to build a dictionary from a list of string samples where each sample is in the format "key->value". Return the constructed dictionary. If the list is empty, return an empty dictionary.
  
  def build_dictionary(samples):
      dictionary = {}
      for sample in samples:
          key, value = sample.split("->")
          dictionary[key] = value
      return dictionary
  
  samples = ["apple->red", "banana->yellow", "cherry->red"]
  assert build_dictionary(samples) == {'apple': 'red', 'banana': 'yellow', 'cherry': 'red'}
  
  samples = []
  assert build_dictionary(samples) == {}
output: def build_dictionary(samples):
      dictionary = {}
      for sample in samples:
          key, value = sample.split("->")
          dictionary[key] = value
      return dictionary