public boolean unmap(String path) {
        return routes.remove(path);
    }
Unmaps a particular route from the collection of those that have been previously routed.
Search for previously established routes using the given path and unmaps any matches that are found.

@param path the route path
@return <tt>true</tt> if this is a matching route which has been previously routed
@throws IllegalArgumentException if <tt>path</tt> is null or blank
src/main/java/spark/Service.java