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

char* repeat_char(char ch, int num_repetitions) {
    char* s = malloc((num_repetitions + 1) * sizeof(*s));  // +1 is for '\0'
    for(int i = 0; i < num_repetitions; i++) {
        s[i] = ch;
    }
    s[num_repetitions] = '\0';  // set the last character to '\0'
    return s;
}

int main(int argc, char* argv[]) {

    int width = 3;
    char ch = 'a';
    char* divider = repeat_char('a', width);
    printf("%s\n", divider);

    return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */