pset3 output seemingly correct but not for check50

Question

My problem is that I cannot make it correct in the check50 although the output from the simple testing seemingly fine. It would be grateful if anyone could help me understanding how to solve this. Thank you.

Here is my code.

    #include <cs50.h>
    #include <stdio.h>
    #include <string.h>

    // Max number of candidates
    #define MAX 9
    // Candidates have name and vote count
    typedef struct
    {
        string name;
        int votes;
    }
    candidate;

    // Array of candidates
    candidate candidates[MAX];

    // Number of candidates
    int candidate_count;

    // Number of voters
    int voter_count;

    // Function prototypes
    bool vote(string name);
    void print_winner(void);

    int main(int argc, string argv[])
    {
        // Check for invalid usage
        if (argc < 2)
        {
            printf("Usage: plurality [candidate ...]\n");
            return 1;
        }

        // Populate array of candidates
        candidate_count = argc - 1;
        if (candidate_count > MAX)
        {
            printf("Maximum number of candidates is %i\n", MAX);
            return 2;
        }
        for (int i = 0; i < candidate_count; i++)
        {
            candidates[i].name = argv[i + 1];
            candidates[i].votes = 0;
        }

        voter_count = get_int("Number of voters: ");

        // Loop over all voters
        for (int i = 0; i < voter_count; i++)
       {
            string name = get_string("Vote: ");

            // Check for invalid vote
            if (!vote(name))
            {
                printf("Invalid vote.\n");
            }
        }

        // Display winner of election
        print_winner();
    }

    // Update vote totals given a new vote
    bool vote(string name)
    {
        // TODO
        for (int n = 0; n < candidate_count; n ++)
        {
            if (strcmp(candidates[n].name, name) == 0)
            {
                candidates[n].votes ++;
                return true;
            }
        }
        return false;
    }
    // Print the winner (or winners) of the election
    void print_winner(void)
    {
        // TODO
        for (int n = voter_count; n > 0; n--)
        {
            int counter = 0;
            for (int c = 0; c < candidate_count; c++)
            {
                if (candidates[c].votes == n)
                {
                    printf("%s\n", candidates[c].name);
                    counter ++;
                }
            }

            if (counter > 0)
            {
                return;
            }
        }
    }

Below is check50 results.

Here is a testing result.

Thank you very much for your help.

Answer 1

Program violates this instruction from the spec:

You should not modify anything else in plurality.c other than the implementations of the vote and print_winner functions (and the inclusion of additional header files, if you’d like).