Removed un-unused prototype
Removing error checking
Added call to create '.nth' dir
Added empty definition for subtraction
Added subtraction plugin implementation
Added empty definitions of remaining operations
Added multiplication plugin implementation
Added early help plugin
Added plugin-description member
Added description field to printing
Added 'help' description
Added plugin description
Added missing call to 'free'
Writing results only if number is greater than zero
Added plugin description
Added plugin description
Added plugin description and new name
Added missing call to 'free'
Added plugin description
Added method to print a cleaner list of plugins