Why is my code returning empty string only

#1

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#2

@tusharbajaj200153_02bc6c0c5583c81d, send link by saving code here https://ide.codingblocks.com/

#3
#4

i also tried this one but its not passing the test case

#5

@tusharbajaj200153_02bc6c0c5583c81d,
check this : https://ide.codingblocks.com/s/657028

#6

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