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