flatwhatson/prescheme-demo: A collection of example programs in Pre-Scheme @ inlining-more

Andrew Whatson bb2985632c Add zero-seed variant of vector-unfold		1 rok temu
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ps-string.scm	c4afd5f6f0 Add string-repeat and vector-of-strings example	1 rok temu
ps-vector.scm	bb2985632c Add zero-seed variant of vector-unfold	1 rok temu