#define _CRT_SECURE_NO_WARNINGS
#include "stringhe.h"

char *spacefill(const char *str, size_t n)
{
    if(str == NULL)
        return NULL;


    int len = strlen(str);
    if (len >= n) {
        char *s = malloc((len+1) * sizeof(char));
        s[len] = 0;
        s = strcpy(s, str);
        return s;
    }

    size_t size = n - len;
    char *s = malloc(size*sizeof(char));

    memset(s, 32, size);

    s = realloc(s, (size + 1) * sizeof(char));
    s[size] = 0;
    size++;

    char *res = malloc((size-1 + strlen(str)) * sizeof(char));
    res = strcat(s, str);
    free(s);

    return res;

}

int main(void) {

    char str[] = "ciao";
    char *res = spacefill(str, 10);
    free(res);

    return 0;
}