Specification Modify the program above, further simplifying communications between functions by using global variables. Implementation download program runningAveGlobal.c. Complete the main() function. download program function.c. Complete function void r_avg(), which computes and displays the running average. Notice that this function takes no arguments. define all global variables in function.c Sample Inputs/Outputs: red 307 % gcc-Wall runningAveLocal.c red 308 % a.out Enter number (-1 to quit): 10 running average is 10 / 1 = 10.000 Enter number (-1 to quit): 20 running average is 30 / 2 = 15.000 Enter number (-1 to quit): 33 running average is 63 / 3 = 21.000 Enter number (-1 to quit): 47 running average is 110 / 4 = 27.500 Enter number (-1 to quit): 51 running average is 161 / 5 = 32.200 Enter number (-1 to quit): 63 running average is 224 / 6 = 37.333 -1 Enter number (-1 to quit): red 309 % int main(int argc, char *argv[]) { int input; printf("Enter number (-1 to quit): "); scanf("%d", &input); while(input != -1){ r_avg(); // read again } return 0; }