chore: used template literals instead of string additions

[zt4ff]

Description

used template literals instead of adding numbers or string

Closes #475

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• [X} I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• My changes generate no new warnings

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