Add solution for Challenge 3 by MaryNfs

[MaryNfs]

Challenge 3 Solution

Submitted by: @MaryNfs
Challenge: Challenge 3

Description

This PR contains my solution for Challenge 3.

Changes

• Added solution file to challenge-3/submissions/MaryNfs/solution-template.go

Testing

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

Thank you for reviewing my submission! 🚀

[coderabbitai]

Walkthrough

This PR introduces a new Go solution file implementing Employee and Manager types with methods to add employees, remove by ID, calculate average salary, and find employees by ID. The Manager stores a slice of Employee records and provides operations to manipulate and query them.

Changes

Cohort / File(s)	Summary
Challenge 3 Solution challenge-3/submissions/MaryNfs/solution-template.go	Introduces Employee and Manager types with four manager methods: AddEmployee() appends to the employee slice, RemoveEmployee() removes by ID using slices.Delete, GetAverageSalary() computes mean salary (returns 0 for empty list), and FindEmployeeByID() returns a pointer to the matching employee or nil.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Add Challenge 3 solution by mellojp #1113: Implements identical Employee and Manager types with the same four methods (AddEmployee, RemoveEmployee, GetAverageSalary, FindEmployeeByID) for the challenge-3 submission.
• Add solution for Challenge 3 by manish-npx #823: Adds the same Employee and Manager struct definitions and implements the same manager methods in package main.
• Add solution for Challenge 3 by elecycele #802: Implements nearly identical Employee and Manager types and the same four methods for the challenge-3 solution.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% 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 reflects the main change: adding a Challenge 3 solution by MaryNfs to the repository.
Description check	✅ Passed	The description is directly related to the changeset, explaining that it contains a Challenge 3 solution submitted by MaryNfs with clear details about what was added and testing claims.

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