Update tests for wordle

[sryabkov]

What

Update tests for wordle to verify the program's behavior on words with repeating letters

Why

My first version of wordle (wordle_bug.c) didn't correctly handle words with repeating letters:

The existing test didn't catch the problem but the test modified in this PR does:

The modified test also works OK on the correct version of the program (wordle_correct.c):

Finally, the correct version of the program also works correctly with hardcoded grill:

Notes

I am attaching all the files used for testing this PR in wordle_source.zip:

• wordle_bug.c - a version of the program with a bug. It passes the original test but fails the modified test
• wordle_bug_grill.c- same as wordle_bug.c but hardcodes choice to grill
• wordle_correct.c - a version of the program without the bug. It passes both original and modified test
• wordle_correct_grill.c - same as wordle_correct.c but hardcodes choice to grill