input: Write a python function to generate a Fibonacci series from a given start index to an end index.
  assert get_fibonacci_series(0, 5) == [0, 1, 1, 2, 3, 5]
  assert get_fibonacci_series(5, 10) == [5, 8, 13, 21, 34, 55]
  assert get_fibonacci_series(2, 6) == [1, 1, 2, 3, 5]
output: def get_fibonacci_series(start, end):
      fib_series = [0, 1]
      while len(fib_series) <= end:
          fib_series.append(fib_series[-1] + fib_series[-2])
      return fib_series[start:end+1]