Refactor: Error handling and logging

[formatkaka]

Resources

Error handling

1. https://www.bacancytechnology.com/blog/golang-error-handling
2. https://levelup.gitconnected.com/better-error-handling-in-golang-theory-and-practical-tips-758b90d3f6b4
3. https://www.digitalocean.com/community/tutorials/creating-custom-errors-in-go
4. https://earthly.dev/blog/golang-errors/

Logging

1. https://stackoverflow.com/questions/41389933/when-to-use-log-over-fmt-for-debugging-and-printing-error

Changes made in code

• Use only log.Print
• Error wrapping fmt.Errorf()
• Building custom errors