In function ‘Calculate_Duty’: error: nested functions are disabled, use -fnested-functions to re-enable - switch-statement

Question

include
/* Declare function prototypes */
float Calculate_Duty (int, int);
void Print_Duty (float);
int main (void)
{
/* Declare all variables to be used in the program */
char more_to_process;
int origin, category, quantity, num_ship=0;
float unit_price;
float cost, duty, total_ship=0;
float total_duty=0, tax_rate=0;
/* Begin to execute the program */
printf("Do you have more customs forms to process? Type: Y for yes or N for no \n");
scanf(" %c", &more_to_process);
while ((more_to_process =='Y') && (more_to_process!='N'))
{
printf ("What is the origin of the goods? Type: 1 for US, 2 for China, 3 for Brazil \n");
scanf ("%d", &origin);
printf ("What category of goods? Type: 1 for food, 2 for clothing, 3 for wood \n");
scanf ("%d", &category);
printf ("What is the quantity? \n");
scanf ("%d", &quantity);
printf ("What is the unit price? \n");
scanf ("%f", &unit_price);
total_ship= quantity * unit_price;
/* Calculate the duty of the shipment */
tax_rate= Calculate_Duty (origin, category);
duty= tax_rate * total_ship;
total_duty+= duty;
/* Print the duty of the shipment */
printf ("Origin \t Category \t Quantity \t Unit Price \t Shipment \t Tax Rate \t Duty \t \n");
printf ("%d \t %d \t \t %d \t \t %02.f \t \t %0.2f \t %0.2f \t \t %0.2f \t \n", origin,
category, quantity, unit_price, total_ship, tax_rate, duty);
Print_Duty (duty);
printf ("Do you have more customs forms to process? Type: Y for yes, N for no \n");
scanf (" %c", &more_to_process);
++num_ship;
}
printf ("Transaction Summary: \n");
printf ("Number of Shipments Processed = %d \n", num_ship);
printf ("Total Duties Collected = $ %0.2f \n", total_duty);
return 0;
}
/* Perform the function Calculate_Duty */
float Calculate_Duty (int origin, int category)
{
float duty;
switch (origin)
{
/* Case 1 is for US */
case 1:
switch (category)
{
case 1:
duty=0;
break;
case 2:
duty= 0;
break;
case 3:
duty= .05;
break;
}
break;
/* Case 2 is for China */
case 2:
switch (category)
{
case 1:
duty= .02;
break;
case 2:
duty= .03;
break;
case 3:
duty= .04;
break;
}
break;
/* Case 3 is for Brazil */
case 3:
switch (category)
{
case 1:
duty= .01;
break;
case 2:
duty= .02;
break;
case 3:
duty= .08;
break;
}
return duty;
}
/* Perform the Print_Duty function */
void Print_Duty (float duty)
{
printf ("The amount due is $ %0.2f \n", duty);
}

Answer 1

As I can see one } is missing from switch(origin), before return duty.