BARNSTABLE — Younger folks can master a good deal at Barnstable Substantial College: how to solve an algebra dilemma, how to browse DNA code and how to make sense out of literary classics. Some learners are even mastering what it usually takes to start a small business.   In a competition similar to TV’s “Shark Tank” — where business people try out to convince a panel of tycoons to invest in their idea — college students recently pitched their company suggestions to a panel of judges. Rising from the pack on June 14 were Nicholas Pouliot and Dominic Ford, who received prizes at a New England semi-remaining level of competition for younger business people.  The opposition was sponsored…