Add solution for Challenge 18 by Mxn-ptr

[Mxn-ptr]

Challenge 18 Solution

Submitted by: @Mxn-ptr
Challenge: Challenge 18

Description

This PR contains my solution for Challenge 18.

Changes

• Added solution file to challenge-18/submissions/Mxn-ptr/solution-template.go

Testing

• Solution passes all test cases
• Code follows Go best practices

Thank you for reviewing my submission! 🚀

[coderabbitai]

Walkthrough

A new Go source file is added implementing temperature conversion functions CelsiusToFahrenheit and FahrenheitToCelsius, with a rounding helper utility and example usage in main.

Changes

Cohort / File(s)	Summary
Challenge 18 Solution challenge-18/submissions/Mxn-ptr/solution-template.go	Adds temperature conversion functions with Celsius↔Fahrenheit conversion logic (F = C × 9/5 + 32 and inverse), a Round helper for decimal precision using math.Round and math.Pow10, and example main function demonstrating both conversions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Add solution for Challenge 18 by 0xtrooper #881: Adds identical temperature conversion functions (CelsiusToFahrenheit, FahrenheitToCelsius, Round) to Challenge 18 solution template.
• Add solution for Challenge 18 by goholic #1193: Introduces nearly identical Challenge 18 Go solution with same conversion functions and rounding helper.
• Add solution for Challenge 18 by ansmonjol #754: Adds the same temperature conversion API (CelsiusToFahrenheit, FahrenheitToCelsius, Round) to Challenge 18 solution template.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically identifies the main change: adding a solution for Challenge 18 by a specific contributor (Mxn-ptr), which directly matches the changeset.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the challenge submission, the file location, and testing status. It clearly describes the purpose and contents of the PR.

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