Refactor and Improve Readability of PDF Generation Code

[Ananya54321]

Proposed Improvements:
Modularization: Extract repetitive logic into helper functions (e.g., for creating images, processing characters, and managing color adjustments) to improve clarity and reduce duplication.
Promise Handling: Streamline promise management to ensure that all asynchronous calls are handled consistently.
String Template Literals: Use template literals for string concatenation to enhance readability.
Clear Function Naming: Rename functions and variables to better reflect their purpose and enhance clarity.
Performance: Make slight adjustments to improve the overall performance of the code.