All issues corrected

[Shanks13-37]

Changes made:

1

Initializing the rev string with elements of str string from backward.

##2
incrementing 'even' instead of 'i'.

##3
each element of the new string is initialized with the corresponding element of the z string in the for loop.

##4
bubble sort.

##5
The break should be for the case and not inside the for loop, then the break exits the for loop but not the case thus giving an error. And int flag =0 and declaring just the variable flag does not make any difference.

##6
strcmp gives 1 if the strings are the same but 1 is taken as false in the if statement so !strcmp corrects it.

##7
b is a pointer that has the address of 7 so (a+b) won't give us the sum of a+7, we need to dereference the pointer by writing *b so it (a+*b).

##8
The for loop goes on incrementing until it comes across \0 which is always at the end of the string literals stored in str.

##9
If n==0 then the value returned will be 1 if not then it implements the else statement which includes recursion.