added extra error string test for multiple digits
last do dads, time to delete
removed all files, ready to do kata again
first test passing, returning 0 for empty string entered
when 1 is entered 1 is returned test is passing
when 2 is entered 2 is returned test is passing
refactored and added make_calc method
returning 3 if 1,2 test passing
returning 4 if 2,2 entered test passing
returning 55 if 1,2,3,4,5,6,7,8,9,10
test is passing
newline addition being handled, test passing green light
handling arbitrary delimiter test passing
throwing error if negative number is entered test is passing
getting matching error strings test green light done