Grind for suffix

[cravall]

Hi, it would be great to be able to grind for a suffix instead of a prefix... I started looking into it but I don't know C++ 😦

[cravall]

I have added the ability to grind for a suffix using the CPU here - #11

[cravall]

This MR (#8) appears to have the ability to grind for suffixes, but it's quite a convoluted MR... not really the "minor changes" in it's title 😂