Add solution for Challenge 18 by onomica

[onomica]

Challenge 18 Solution

Submitted by: @onomica
Challenge: Challenge 18

Description

This PR contains my solution for Challenge 18.

Changes

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

Testing

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

Thank you for reviewing my submission! 🚀

[coderabbitai]

Walkthrough

Adds a new Go solution file for Challenge 18 containing temperature conversion utility functions. Implements CelsiusToFahrenheit, FahrenheitToCelsius, and Round functions, along with a main function demonstrating their usage with example temperature conversions and formatting.

Changes

Cohort / File(s)	Summary
Temperature Conversion Utilities challenge-18/submissions/onomica/solution-template.go	Added three exported functions: CelsiusToFahrenheit (applies formula C × 9/5 + 32 with 2-decimal rounding), FahrenheitToCelsius (applies formula (F - 32) × 5/9 with 2-decimal rounding), and Round (utility for rounding values to specified decimal places using math.Pow10 and math.Round). Includes main function with example usage.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Add solution for Challenge 18 by yz4230 #765: Adds identical CelsiusToFahrenheit, FahrenheitToCelsius, and Round functions with equivalent implementations.
• Add solution for Challenge 18 by Johrespi #651: Implements the same three exported functions for temperature conversion and rounding with identical logic.
• Add solution for Challenge 18 by AlexO-85 #691: Adds the same three functions with equivalent rounding logic in a different Challenge-18 solution file.

🚥 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 accurately summarizes the main change: adding a solution for Challenge 18 by onomica to the repository.
Description check	✅ Passed	The description is directly related to the changeset, clearly explaining that it contains a Challenge 18 solution submission with relevant context about testing and code quality.

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[github-actions]

🎉 Auto-merged!

This PR was automatically merged after 2 days with all checks passing.

Thank you for your contribution, @onomica!