Why I couldn't require 'string.rb' file in ruby -

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I am applying the gem, I want to add some custom methods to the string class. Therefore, I have created the 'lib' directory sub-directory 'core_ext', and placed the 'string.rb' file there. string / Pre>

I have created in my main file: 

  is required 'core_ext / string.rb' P> but its string has no effect on class,  
 If I change the file name to another name, like 'my_string.rb' and change the line with requirement, then everything will work properly. Why can not I use 'string.rb' as the file name?   
 
 
 If there is a file name  core_ext / string  which loads from anywhere else It's done, it is also loaded one. You may need to come up with a different name.  
 Ruby 1.9 has a  needed_relative  feature that p11y states that this is a better solution.

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