json SplitString(string fullstring, string substring)
{
    json result = JsonArray();

    int index = FindSubString(fullstring, substring);
    while (index > -1)
    {
        result = JsonArrayInsert(result, JsonString(GetSubString(fullstring, 0, index)));
        // if this is too high, it's ok, it just goes to the end of the string
        int stringLength = GetStringLength(fullstring);
        fullstring = GetSubString(fullstring, index + GetStringLength(substring), stringLength);
        index = FindSubString(fullstring, substring);
    }
    result = JsonArrayInsert(result, JsonString(fullstring)); // include all to the end of the string

    return result;
}