second implementation for input and fix unit_tests

Wordsalat/unit_tests.c

@@ -49,6 +49,8 @@ void test_readWords_with_delimiters(void) {
     int count = readWords(f, words, 10);
     fclose(f);
 
+    char cwd[PATH_MAX];
+
     TEST_ASSERT_EQUAL_INT(3, count);
     TEST_ASSERT_EQUAL_STRING("HUND", words[0]);
     TEST_ASSERT_EQUAL_STRING("KATZE", words[1]);