RUSSELLVILLE, Ky. — Around Russellville, many people know Charlie Robertson by one nickname: the Cat Man. But for Charlie and his wife, Mary Nell, caring for stray cats isn’t about a nickname—it’s a daily commitment they’ve kept for nearly a decade. The Todd County couple makes the drive into Logan County every day, seven days a week, bringing food and fresh water to cat colonies scattered throughout the area. Even during snow, rain and ice stor…