Kata

You must implement a function that returns the difference between the largest and the smallest value in a given list / array (lst) received as the parameter.

• lst contains integers, that means it may contain some negative numbers
• if lst is empty or contains a single element, return 0
• lst is not sorted

[1, 2, 3, 4]   //  returns 3 because 4 -   1  == 3
[1, 2, 3, -4]  //  returns 7 because 3 - (-4) == 7

Have fun!