'while i < n' to 'while x != n' code optimization

[jsandinoDev]

• [✅] issue #207
• [✅] follows contribution guide
• [✅] code change includes tests

Change all the posible 'while i < n' to 'while x != n'. The ones that were not changed generated certain errors in the tests

Closes #207

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[jsandinoDev]

Hi @b-j-roberts can you give it a check to this PR?