String Window(Test cases)

#1

Here is my code: https://ide.codingblocks.com/s/237531
Some of the test cases are failing in this. Please tell me what i am doing wrong.

#2

Consider a case:
a b c derse qqw q e rety lorem ipsum wq . / \ ! fre
w f

Expected Output:
wq . / \ ! f

Your Output:
w

You can refer the approach from here String window problem

#3

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