Margie Schmidt has extremely strong arms. She’s 60 years old, and recently had foot surgery; she takes summers off, when she enjoys holidays to Ireland, and dozes off in her sunny backyard. But from October through March or April, she’s a force, working 12-hour days (sometimes overnight) pulling batches of sugar-and-water globs, cutting and shaping fresh candy canes on the original marble slab inside the Schmidt’s Candy store on Jamaica Avenue in Woodhaven.