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#1

ide is showing that the code is dumped

#2

Your mistake
at line no 26 in your code
while(fast->next!=NULL and fast!=NULL)

first you have make sure that fast!=NULL then only check fast->next
because is fast is null then fast->next will give run time error

so correct statement is
while(fast!=NULL and fast->next!=NULL)

Modified code

#3

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