Write a recursive function void mirror(void) that reads character by character (using
the function getchar()) a string terminated by ? and then displays the string in reverse order.
void main()
{
      mirror();
}

Difficulty level
This exercise is mostly suitable for students 
void mirror()
{
	char c;
	c=getchar();
	if(c!='?')
		mirror();
	putchar(c);
}
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