how to split ruby code like c or c++ code : I'd like to split the long ruby code into another ruby source files, in c source file , I can put the code like this:
```
a.c
  if (xxx)
    #include "my_file.c"

my_file.c
    printf("yes we are in xxx conditions");
```
now in ruby code I can't do that like:
```
a.rb
  case condition
  when "a"
     puts "a"
  load (or include "b.rb")
  end

b.rb
  when "b"
     puts "we are in b.rb"
```
so how to solve the ruby code just like in c source file. thanks