Desired outupt is not coming

#1


i didn’t know the error pls sort this out and what does null character (’\0’) mean why are we using it

#2

in code you have mistyped
it should be ‘/0’ not ‘/n’

'\ 0 ’ is idiomatic for specifying a NUL character (because you cannot type such a character from the keyboard or display it in your editor).
The NUL character is used in C and C++ to terminate a string stored in a character array.

in simple words we can say that
‘/0’ represent ending of character array
hence can be used to check whether we are at end of string(character array) or not
while traversing

#3

modified Code