"Clean Code: A Handbook of Agile Software Craftsmanship" is a very interesting book, since it contains a lot of best practices and advices for programmers. I recommend this book to anyone who wants to improve his/her code. Here’s a fragment from the book which I find very compelling:

Women Who Code is a community of technicians formed in 2011 who decided to change the experience for women working in engineering.

In any cases, duplicate code should be avoided, because code reuse, encapsulation and maintainability are not accomplished. If encapsulation/code reuse is made properly, then we know for sure that we won't revisit that working code (unless we need to extend it). Writing good code and following best practices avoid technical debt.