input: Write a function to perform string slicing in Python that takes a string and two indices (start and end), and returns the slice of the string from the start index to the end index (exclusive).
  
  def slicing(string, start, end):
      return string[start:end]
  
  assert slicing("This is a slicing test", 8, 15) == "a slicing"
  assert slicing("Python is fun", 0, 6) == "Python"
  assert slicing("Coding", 3, 6) == "ing"
  assert slicing("Hello World", 6, 11) == "World"
  assert slicing("", 0, 0) == ""
output: def slicing(string, start, end):
      return string[start:end]