input: Write a function to perform string slicing in Python that takes a string and start and end indices, and returns the specified slice of the string.
  
  def slicing(string, start, end):
      return string[start:end]
  
  assert slicing("This is a slicing test", 8, 15) == "s a slic"
  assert slicing("Hello World", 0, 5) == "Hello"
  assert slicing("Python is awesome", 7, 15) == "is awesom"
  assert slicing("Quick brown fox", 4, 9) == "k bro"
  assert slicing("", 0, 0) == ""
output: def slicing(string, start, end):
      return string[start:end]