DimensionalMechanics interview questions

Interview starts with an email from HR and a following chat. They asked me to solve a coding problem within 48 hours. I did solve it, few weeks later after waiting in dark, they said not going to move forward with me. No feedback and reason given, I asked them about feedback but never heard back from them. At least they should tell me the answer is wrong or the run time is not expected or something like that.