This code represents a functional implementation of a weighted raffle system in Go, handling participant information, item values, weighted selection of winners, and result storage in CSV format. The strucutre of the input csv is: item,value,participant(s)

Data Structures:

• Participant: Represents a participant in the raffle with their name and a map of item names indicating if the participant has won the item.
• Item: Represents an item in the raffle with its name, value, and an array of participant names for the current item.

Functions:

• WeightedRaffle: Conducts the weighted raffle by picking a winner for each item based on their values and participants. It iterates over the items, displays eligible participants, prompts for confirmation, picks a winner, updates wins for the winner, and handles participant opt-out.
• sortItemsByValue: Sorts items by value in ascending order.
• pickWinner: Picks a winner from the provided participant names based on their chance of winning.
• displayEligibleParticipants: Displays the eligible participants for the current item and their total previous wins.
• WriteResultsToCSV: Writes the results (item and winner) to a CSV file.

Main Functionality:

• Reads data from a CSV file (raffle_data.csv), where each row represents an item in the raffle with its value and participants.
• Parses the CSV records, creating items and updating participant information.
• Displays the total list of participants.
• Prompts the user to start the raffle.
• Conducts the weighted raffle using the parsed items and participants.
• Writes the raffle results to a new CSV file (raffle_results.csv).

Execution:

• The program is executed from the main function, where it reads the CSV data, conducts the raffle, and writes the results to a file.