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how to comparing two slightly different strings and return Percent likeness between the two strings

I need to comparing two slightly different strings and return Percent likeness between the two strings This could have been easier for two strings of same length. But what if the length is different? For Example :

I like to help everybody
Hi I would like to help every coder 

A simple logic would be to compare each word in first sentence with same position word of different sentence. But in this case the length is different. So how do I proceed?

Any help would be appreciated.

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