void file_read(FILE *f, content *c) {
    char buffer[BUFFER_SIZE];
    (*c).size = 0;
    int i = 0; // amount of times going in cycle
    while (1) {
        if ((*c).size + BUFFER_SIZE > (*c).capacity) {
            (*c).data = (char*)realloc((*c).data, (*c).capacity + BUFFER_SIZE);
        }
        int count = fread(buffer, sizeof(char), BUFFER_SIZE, f);
        memcpy((*c).data, buffer, count);
        (*c).size += BUFFER_SIZE;
        i++;
        if (count < BUFFER_SIZE) {
            break;
        }
    }
}