input: Write a python function to get the longer string between two strings.
  assert get_longer_string("apple", "banana") == "banana"
  assert get_longer_string("hello", "world") == "hello"
  assert get_longer_string("Python", "Java") == "Python"
output: def get_longer_string(str1, str2):
      return str1 if len(str1) > len(str2) else str2