Recursion and stack

[bogdanbacosca]

line 11 - minor improvement line 42 - minor improvement, should probably revert back to : line 111 - added single for more clarity line 124 - improvement line 191 - improvement line 217 - grammar fix line 329 - should probably be reverted? line 328 - grammar fix line 346 - improvement added comment lines for sumSalaries function line 430 - improvement line 470 - grammar fix line 489 - improvement line 498 - replacing prepend in this comment would remove some of the novelty, since prepend is not a word frequently used line 513 - not sure if garbage collecting was introduced in the tutorial at this point, we might want to add a link to that here in any case. line 515 - grammar fix line 517 - minor suggestion line 519 - minor suggestion line 523 - minor suggestion line 531 - formatting: removed empty space recursive step breakdown for task 5