8 kyu - Correct the mistakes of the character recognition software.md

Task

Character recognition software is widely used to digitise printed texts. Thus the texts can be edited, searched and stored on a computer.

When documents (especially pretty old ones written with a typewriter), are digitised character recognition softwares often make mistakes.

Your task is correct the errors in the digitised text. You only have to handle the following mistakes:

S is misinterpreted as 5 O is misinterpreted as 0 I is misinterpreted as 1 The test cases contain numbers only by mistake.

My solution

def correct(string)
  string.gsub(/[501]/, '5' => 'S', '1' => 'I', '0' => 'O')
end

Better solution

def correct(string)
  string.tr('501','SOI')
end