The challenges' numbering was updated

[albhasan]

Closes #158

The challenges' numbering was updated in lesson 03 (data structures).

[github-actions]

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The following changes were observed in the rendered markdown documents:

 03-data-structures-part1.md | 10 +++++-----
 md5sum.txt                  |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

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⏱️ Updated at 2025-05-25 00:13:25 +0000

[coopermkr]

Numbering is correct.