C language Please!

12.2 P2 - Ex1: Shifting Write a program that takes a string of 21 characters and shift the content (left or right) by a given amount Details You will be given the string properly initialized where the last element (position 20) is going to be the null character 10. You will be given the shift amount as an integer number (positive or negative) A shift to the left is going to be represented by negative numbers and to the right by positive numbers You must only print out the resulting shifted string. Note: the last character of your string must be always the null character Example 1 When the input is: Shift: 4, string: How are you, World!? The output is ld! ?How are you, Wor Example 2: When the input is: Shift: -5, String: How are you, World!? The output is re you, World! ?How a