[Feature] Z function implementation

[vakhokoto]

I can't find Z function implementation here so I will write that. There is a link of an algorithm below.
Z funciton: https://www.geeksforgeeks.org/z-algorithm-linear-time-pattern-searching-algorithm/

[dipayanDebTheCoder]

Can you please assign me this. This seems interesting. I would love to do this

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