Ballpark challenge in C

Question

Hi, trying to do ballpark challenge in C, however I can only get the first two test cases working..please let me know if this can be coded better
https://code.sololearn.com/cy0vNDXAjjKD/?ref=app

Answer 1

You and three friends go to a baseball game and you offer to go to the concession stand for everyone. They each order one thing, and you do as well. Nachos and Pizza both cost $6.00. A Cheeseburger meal costs $10. Water is $4.00 and Coke is $5.00. Tax is 7%.
Task
Determine the total cost of ordering four items from the concession stand. If one of your friend’s orders something that isn't on the menu, you will order a Coke for them instead.
Input Format
You are given a string of the four items that you've been asked to order that are separated by spaces.
Output Format
You will output a number of the total cost of the food and drinks.
Sample Input
'Pizza Cheeseburger Water Popcorn'

Answer 2

You have to focus on this part:
"If one of your friends orders something that isn't on the menu, you will order a Coke for them instead."