Fixed incorrect prompt handling #32
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Issue: tester used grep -vF "$PROMPT" unconditionally; when PROMPT was empty this removed all output so minishell results vanished.
Changes: use mkdir -p; detect PROMPT and set GREP_PROMPT=(grep -vF "$PROMPT") or GREP_PROMPT=(cat) if empty; replace direct grep -vF uses with "${GREP_PROMPT[@]}".
Commit message suggestion: "tester: avoid stripping all output when PROMPT is empty; use mkdir -p"