Implement validation for Book

[GregoryAlbouy]

Description

Tasks

Suggestions

• For easy validation you can use ozzo-validation
• Usage example on another project:

  func (u User) Validate() error {
      return validation.ValidateStruct(&u,
    	  validation.Field(&u.Email, is.EmailFormat),
    	  validation.Field(&u.Password, validation.Required, validation.Length(8, 50)),
    	  validation.Field(&u.Username, validation.Required, is.Alphanumeric, validation.Length(3, 20)),
      )
  }

Notes

Estimated time

2h