module Log
    def log(text)
        puts "[LOG] #{text}" 
    end
end

require_relative 'log'

class User 
    include Log

    def initialize(name)
        log "initialize is called"
        @name = name
    end
    
    def hello
        log "hello is called"
        puts "Hello, #{@name}!"
    end
end

user = User.new("Alice")
user.hello

# [LOG] initialize is called
# [LOG] hello is called
# Hello, Alice!