input: Write a python function to find the longer string between two given strings.
  assert get_longer_string("Hello", "World") == "Hello"
  assert get_longer_string("Python", "Code") == "Python"
  assert get_longer_string("short", "longer") == "longer"
output: def get_longer_string(str1, str2):
      return str1 if len(str1) >= len(str2) else str2