typedef struct my_custom_func
{
    void *func_address;
    int  numParams;
}

void firstFunc (long int param1) {...};
void secondFunc (long int param1, long int param2) {...};
void thirdFunc (long int param1, long int param2, long int param3) {...};

my_custom_func funcArray={
    {&firstFunc, 1},
    {&secondFunc 2},
    {&thirdFunc  3}
}; 

{
   int i;
   for (i=0;i<3;i++)
   {
      if (funcArray.numParams==1)
         (*funcArray.funcAddress)(param1);
      if (funcArray.numParams==2)
         (*funcArray.funcAddress)(param1,param2);
      if (funcArray.numParams==3)
         (*funcArray.funcAddress)(param1,param2,param3);
   }
}

(*funcArray.funcAddress)(param1,param2,param3);