COMPUTER SCIENCE: I need help with the following two functions. The code needs to be written in C:

char kstrget(kstring str, size_t pos)

-Returns the character at index pos in the str's data.

-If pos is out of bounds (greater than or equal to the length of str), this function should abort the program by calling abort().

void kstrput(kstring str, size_t pos, char ch)

-Replaces the character at index pos in str's data with the character ch.

-If pos is out of bounds (greater than or equal to the length of str), this function should abort the program by calling abort().