Creating a Simple Cafe Menu

Question

i was asked to do a simple programming but i dont know how to make it simple.. i just learn c programming and i used all the basic things about it. i must create a coding with 3 functions. it is about a cafe menu, first function is to display only, 2nd is to calculate and return the prices, 3rd is to print receipt. im stuck at 2nd function :( here is my code..

#include <stdio.h>
#include <string.h>

void displaymenu(void);
double calculate(char* code1[], char* code2[], char* code3[], int quantity1, int quantity2, int quantity3);
double payment(double total);

int main () {
    
    char name[20];
    int tablenum;
    char ord1[3];
    char ord2[3];
    char ord3[3];
    int quant1, quant2, quant3;
    
    printf("~~~~~ Sunny Cafe Order Form ~~~~~ \n");
    printf("Customer Name : ");
    scanf("%s", &name);
    printf(" Table Number : ");
    scanf("%d", &tablenum);
    
    displaymenu();
    
    printf("Order 1 : ");
    scanf("%s", &ord1);
    printf("Order1 quantity: ");
    scanf("%d", &quant1);
    printf("Order 2 : ");
    scanf("%s", &ord2);
    printf("Order2 quantity: ");
    scanf("%d", &quant2);
    printf("Order 3 : ");
    scanf("%s", &ord3);
    printf("Order3 quantity: ");
    scanf("%d", &quant3);
    
    double total_price, total_bill;
    total_price = calculate(ord1, ord2, ord3, quant1, quant2, quant3);
    total_bill = payment(total_price);
    
    printf(" Please Come Again!");
    
    return 0;
}

void displaymenu() {

printf("~~~~~ Sunny Cafe Menu ~~~~~ \n");
printf("Food Menu:\nf1 - Burger (RM13.50)\nf2 - Sandwich(RM10.50)\nf3 - Hotdog(RM10.00)\nf4 - Pasta(RM12.50)\nf5 - Mushroom Soup(RM8.90)\n\n");
printf("Drinks Menu:\nd1 - Coffee(RM5.90)\nd2 - Tea(RM4.90)\nd3 - Juice(RM6.50)\nd4 - Sky Juice(RM0.50)\nd5 - Fizzy(RM2.00)\n\n");

}

double calculate(char* code1[], char* code2[], char* code3[], int quantity1, int quantity2, int quantity3) {
    
    double price1, price2, price3;
    
    if (code1 = 'f1') {
        price1 = 13.50;
    }
    else if (code1 = 'f2') {
        price1 = 10.50;
    }
    else if (code1 = 'f3') {
        price1 = 10.00;
    }
    else if (code1 = 'f4') {
        price1 = 12.50;
    }
    else if (code1 = 'f5') {
        price1 = 8.90;
    }
    else if (code1 = 'd1') {
        price1 = 5.90;
    }
    else if (code1 = 'd2') {
        price1 = 4.90;
    }
    else if (code1 = 'd3') {
        price1 = 6.50;
    }
    else if (code1 = 'd4') {
        price1 = 0.50;
    }
    else {
        price1 = 2.00;
    }
    
    if (code2 = 'f1') {
        price2 = 13.50;
    }
    else if (code2 = 'f2') {
        price2 = 10.50;
    }
    else if (code2 = 'f3') {
        price2 = 10.00;
    }
    else if (code2 = 'f4') {
        price2 = 12.50;
    }
    else if (code2 = 'f5') {
        price2 = 8.90;
    }
    else if (code2 = 'd1') {
        price2 = 5.90;
    }
    else if (code2 = 'd2') {
        price2 = 4.90;
    }
    else if (code2 = 'd3') {
        price2 = 6.50;
    }
    else if (code2 = 'd4') {
        price2 = 0.50;
    }
    else {
        price2 = 2.00;
    }
    
    if (code3 = 'f1') {
        price3 = 13.50;
    }
    else if (code3 = 'f2') {
        price3 = 10.50;
    }
    else if (code3 = 'f3') {
        price3 = 10.00;
    }
    else if (code3 = 'f4') {
        price3 = 12.50;
    }
    else if (code3 = 'f5') {
        price3 = 8.90;
    }
    else if (code3 = 'd1') {
        price3 = 5.90;
    }
    else if (code3 = 'd2') {
        price3 = 4.90;
    }
    else if (code3 = 'd3') {
        price3 = 6.50;
    }
    else if (code3 = 'd4') {
        price3 = 0.50;
    }
    else {
        price3 = 2.00;
    }
    
    double totprice1 = price1 * quantity1;
    double totprice2 = price2 * quantity2;
    double totprice3 = price3 * quantity3;
    
    printf("%s x %d = %f", code1, quantity1, totprice1);
    printf("%s x %d = %f", code2, quantity2, totprice2);
    printf("%s x %d = %f", code3, quantity3, totprice3);
    
    double result = totprice1 + totprice2 + totprice3;
    
    return result;
}

double payment(double total) {
    
    double amountgiven;
    
    printf(" Total bill : RM %.2f \n", total);
    printf("Customer paid : \n");
    scanf(" %lf", &amountgiven);
    double change = amountgiven - total;
    printf("Balance : RM %.2f", change);
    
}