Super basic. Find last char idx. K&R.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
Remove .o files and change function name.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
Split out to sep file.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>
Preparation for the perceptron.

Signed-off-by: Nick Campbell <nicholas.j.campbell@gmail.com>