Worked on the hashicorp/packer repository to deliver a new HCL2Template capability, focusing on enhancing template expressiveness and simplifying user configurations. Developed and integrated the strcontains function, which enables substring checks within templates, directly into the hcl2template library. The implementation involved Go development with an emphasis on string manipulation and template engine design, ensuring the new function was robust through comprehensive unit testing and seamless integration into the function registry. This addition improved the reliability and maintainability of HCL2 templates, providing users with more flexible configuration options while maintaining high standards for code quality and test coverage throughout the process.