IMC Trading IMC Software Developer Intern interview questions

It took about 2 months for them to get back to me on my application. They sent an e-mail asking me to complete a development test, within 4 days. The test consisted of 2 programming questions, consisting of writing a method within a class. I completed the test, with the needed functions. I wasn't sure if I was allowed to simplify the code into helper functions, since they only asked for 1 function, so I left it the way it was. I did my best to optimize the code as much as possible, complete with comments and self-explanatory variables. The code was corrected for errors in every way I could possibly think of, and I was pretty sure it was error free. I also created a simple main interface, since they did not explain if they would run the program using args[]. I e-mailed my completed test back, then they said they would get back to me no later than the Friday, a week after I completed the test. I received no reply on Friday, so I waited until Tuesday to do a follow up. An automated response was sent back to me, quickly, explaining that the position was highly competitive and that I was rejected. They gave me no reason as to why.