Add solution for Challenge 3 by nasseredine

[nasseredine]

Submitted by: @nasseredine
Challenge: Challenge 3

Description

This PR contains my solution for Challenge 3.

Changes

Added solution file to challenge-3/submissions/nasseredine/solution-template.go
Testing

Solution passes all test cases
Code follows Go best practices
Thank you for reviewing my submission! 🚀

[coderabbitai]

Walkthrough

Adds two new Go solutions: a challenge-3 Employee/Manager implementation with CRUD-like manager methods and a challenge-6 word-frequency function exposing CountWordFrequency(text string) map[string]int.

Changes

Cohort / File(s)	Summary
Challenge 3 — Employee/Manager challenge-3/submissions/nasseredine/solution-template.go	Adds Employee and Manager types; implements AddEmployee, RemoveEmployee(id int), GetAverageSalary() float64, FindEmployeeByID(id int) *Employee; includes a main demonstrating usage. Uses slices.IndexFunc for lookups.
Challenge 6 — Word Frequency challenge-6/submissions/nasseredine/solution-template.go	Adds CountWordFrequency(text string) map[string]int and internal flushToken helper; tokenizes input into lowercase alphanumeric words and returns frequency map.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• RezaSi/go-interview-practice#581: Adds the same Challenge 3 Employee and Manager implementation (same types and manager methods).
• RezaSi/go-interview-practice#1089: Adds matching Challenge 3 Employee/Manager implementation with identical methods and usage example.
• RezaSi/go-interview-practice#664: Adds the same CountWordFrequency(text string) map[string]int implementation in challenge-6.

🚥 Pre-merge checks | ❌ 3

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title mentions Challenge 3, but the changeset includes solutions for both Challenge 3 and Challenge 6, making the title incomplete and misleading.	Update the title to reflect both challenges, e.g., 'Add solutions for Challenge 3 and Challenge 6 by nasseredine'.
Description check	⚠️ Warning	The description only mentions Challenge 3, but the changeset includes solutions for both Challenge 3 and Challenge 6, creating a mismatch with the actual changes.	Update the description to acknowledge and document both Challenge 3 and Challenge 6 solutions.
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

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