class Calculator
def add(a, b)
sum(a, b)
end
def multiply(x, y)
product(x, y)
end
def compute
add(5, 10)
multiply(2, 3)
end
end
class Logger
def log_info(message)
puts message
end
def log_error(error)
warn error
end
end
def standalone_function
puts "hello"
print "world"
end