Pset6 Indexes free() invalid next size error

Question

I'm getting this error when I try to run my server. I don't what's been causing it.

char* indexes(const char* path)
{
    char* path_php = malloc(sizeof(char) * strlen(path));
    char* path_html = malloc(sizeof(char) * strlen(path));
    strcpy(path_php, path);
    strcpy(path_html, path);
    strcat(path_php, "/index.php");
    strcat(path_html, "/index.html");

    if (access(path_php, F_OK) == 0)
    {
        return path_php;
    }
    if (access(path_html, F_OK) == 0)
    {
        return path_html;
    }
    free(path_php);
    free(path_html);

    return NULL;
}

Answer 1

sizeof (char), the sizeof operator returns the size in bytes of char, most likely to be 1, so that path_php has the same longuitud that path. Sure you know which is the mistake that you make.