In this post lab, you will demonstrate your knowledge of strings by writing a simple function to create a copy of a segment of a given string.
Details
  Create a function called string_slice(input_string,
  start_index, end_index) in a filed
  called slicing.py.  This function takes a string and two
  positive integers as parameters.  The function should return a copy
  of the characters from input_string between the specified
  start and end indicies.  Assume that the start index is less than or
  equal to the end index.  The return value should not include the
  character at the end_index.  The
  function must use a for loop to traverse the input
  string and an accumulator to create the return value.
Make sure you have sufficient test cases and that you follow all of the course's coding conventions.
Sample Test Cases
| Function Parameters | Expected Output | 
|---|---|
| 'Hello', 0, 2 | 'He' | 
| 'Hello', 1, 3 | 'el' | 
| 'Hello', 2, 4 | 'll' | 
Submission
Submit your program as a .py file on the course Inquire page before class on Wednesday October 8th.