void * readFileToList(List * self){
    List  * list = List_new();
    StringBuffer *sb = StringBuffer_new();

    const char * input = readFileToBuffer("data.txt", sb, 10000);
    while(input != '\0'){
    if (isdigit(*input))
        {
            StringBuffer_clear(sb);
            while (isdigit(*input))
            {
                StringBuffer_appendChar(sb, *input);
                input++;
            }
            List_add(self, sb);
            input--;
        }
        input++;
    }
    return list;
}