~/workspace/pset5/speller/ $ make speller
clang -fsanitize=signed-integer-overflow -fsanitize=undefined -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wshadow speller.c -lcrypt -lcs50 -lm -o speller
/usr/bin/ld: cannot open output file speller: Is a directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [speller] Error 1