What trade deadline route should Don Sweeney take?

At the end of Friday’s 3 p.m. trade deadline, the struggling Boston Bruins will have a better idea of their future outlook for the rest of the season.

As currently constructed, Boston’s depth down the middle and on the back end isn’t as robust as some of the other Stanley Cup contenders. Over the past month, the third-period meltdowns, defensive lapses and game management struggles exposed the roster’s shortcomings.

Don Sweeney isn’t operating in a position of strength.

According to Cap Friendly, the Bruins have a mere $57,500 of current cap space. They don’t have a pick in the first three rounds of this year’s draft — or a second and fourth the following season — to dangle in a potential…