add BAHTTEXT and DOLLAR with their test files

[zhuyanhuazhuyanhua]

PR Details

Description

Related Issue

Motivation and Context

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Copilot]

Pull Request Overview

Adds Thai baht text conversion and broadens DOLLAR formatting tests across cultures

• Implements BAHTTEXT logic and Thai digit/unit mappings in calc.go
• Adds TestBAHTTEXT and TestDOLLAR in calc_test.go covering zero, integer, decimal, large values, and multi‐culture scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
calc.go	Implemented numToThaiText, Thai digit/unit maps, and BAHTTEXT function
calc_test.go	Imported fmt; added TestBAHTTEXT and TestDOLLAR test suites

Comments suppressed due to low confidence (1)

calc.go:18905

• Consider adding a test case for inputs with more than two decimal places (e.g., 1.234) to verify intended rounding vs. truncation behavior.

decimalPart := int((num.Number - float64(integerPart)) * 100)

[Copilot]

The 'too many args' error message is ambiguous. Consider changing it to "BAHTTEXT requires exactly 1 argument" for clarity.

[Copilot]

[nitpick] Duplicate comment found; you can remove the redundant line to keep comments concise.