Is it possible? Of course. Search for the possible contractions. Replace them with uncontracted forms. Note that SOME forms would not be appropriate for replacement. My name, for example. So an automatic scheme would be problematic. But as long as you have a list of valid forms to replace, this is nothing more than a find and replace.
You can use tools like regexp or strfind to locate the contractions that would be replaced. At that point, the replacement would be simple.
