in c please

b. Often times we end up using same functions in verity of different programs. Instead of rewriting these functions each time we write a program, one good practice is to create your own library of reusable functions. Make a header library functions.h and write all the functions used in the following C program that are not part of the standard or math library. Note that Normal function normalize the given array. Definition of normalization can be found on middle of page 287 of your textbook. #include #include "functions,h" #de fine size 100 int main) double List [Size]: int i, length; printf ("Enter the length of your array (whole number between 1 and 100)) scanf ("%d", &length) ; printf("Enter all %d elements of the array using s pace/return key: ", length); for (i=0; i