Similarity Number

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###Statement Chef switched from array to an string and decided to find out the **similarities** of the strings. The similarity of two strings is defined as the longest prefix common to both of the stings and the **similarity number** of the string is the sum of all such cases. Example: **S** = aaa, **S1** = aaab So S and S1 has **3** as aaa is longest prefix common to both.

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solution.cppC++17

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