An example where we call a wrapper function from main.

sum2

/* Prototypes */
int sum(int, int);
void wrapper();

/* Main program */

int main()
{
  
  wrapper();

  return 0;
}

/* Program definition */

void wrapper(){

  int xToAdd = 1;
  int yToAdd = 1;

  int z = sum(xToAdd, yToAdd);  //  z will become 2 here
}

int sum(int x, int y)
{
  return x+y;
}