Here's the problem. After adding to helpers.c a linear search that will return true if the value is found (per the pset3 spec), I "make all" in the terminal to update helpers.c before testing it, but get the following error:
helpers.c:34:1: error: control may reach end of non-void function [-Werror,-Wreturn-type]
^ 1 error generated. make: *** [find] Error 1
I've searched the threads here and have seen many questions (many labeled duplicate) that address this problem. But after reading their answers, I still don't understand a) why this error is occurring and b) how to fix it.