#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>

// OK to copy/adapt if you understand this completely.

char const* write_file(char const* s, char const* filename) {
    FILE* fp = fopen(filename, "w");
    fputs(s, fp);
    fclose(fp);
    return filename;
}

int main(int argc, char* argv[]) {
    // In your tests, you could have something like this:
    char const* filename = write_file("ABC", "abc.txt");
    Frequencies freqs[256] = { 0 };  // initialize entire array to 0
    char const* error = NULL;
    bool did_succeed = calculate_frequencies(freqs, filename, &error);
    // TODO: Add code to calculate frequencies.
    // 
    // This is not complete and has not been tested.
    
    return EXIT_SUCCESS;
}
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