Error (control reaches end of non void function) in hackerblocks

#1

getting answer in code blocks compiler but error in hackerblocks question:https://hack.codingblocks.com/app/contests/1331/430/problem answer:https://ide.codingblocks.com/s/262421 plz help me out

#2

the issue that u r mentioning is related to compiler.
image
return NULL statement in the highlighted area to avoid that warning

#3

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