The language is C. Help is appreciated!

String manipulation functions are often vulnerable to informed C strings: character arrays that lack string terminators. For example, if copy String of Exercise 3.19 is given an ill-formed string as in, it will read and write through memory until a 0 is found or until a segmentation fault occurs. Write a protected version of copy String that transfers at most n - 1 characters from in two out and always writes a string terminator to out./* Copies at most n - 1 characters of string in into the * buffer pointed to buy out. If n is reached, returns - 2. *Otherwise, returns - 1 for malformed input and 0 upon */int copy String N (char * in, char * out, int n); Implement a unit test of copy String N in a main function that exercises its full protective functionality