[7] pry(main)> load './car.rb'
!!!DEBUG: start interface!!!!!
!!!DEBUG: end interface!!!!!
=> true
[8] pry(main)> car =
Car.new=> #<Car:0x000055f817c20a78
@current_rpm=0>
[9] pry(main)> car.fill_tank
NoMethodError: undefined method `fill_tank' for #<Car:0x000055f817c20a78
@current_rpm=0>
from (pry):9:in `
pry'