C programming:Define stubs for the functions called by the below main(). Each stub should print "FIXME: Finish FunctionName()" followed by a newline, and should return -1. Example output:FIXME: Finish GetUserNum()FIXME: Finish GetUserNum()FIXME: Finish ComputeAvg()Avg: -1#include /* Your solution goes here */int main(void) { int userNum1 = 0; int userNum2 = 0; int avgResult = 0; userNum1 = GetUserNum(); userNum2 = GetUserNum(); avgResult = ComputeAvg(userNum1, userNum2); printf("Avg: %d\n", avgResult); return 0;}