Jeff Lenardson and Cole Bevel think they've figured a way to separate their Reno-based MerchantsXL LLC from the rest of an often-indistinguishable pack of competitors.And it's a strategy that makes them feel pretty good about what they're able to provide for the community as well.Their strategy: Give 15 percent of the gross profit generated by MerchantsXL to nonprofits designated by the retailers, restaurants and professional offices that use MerchantsXL to process credit-card payments.On one hand, it takes a 15 percent bite out of MerchantXL's revenues before the company makes payroll for its four-person staff or pays the rent on its …