#include 
    
     #include 
     
      #include 
      
       #include 
       
        void reverse(char s[],int i,int len){   int c,j;   j = len - (i + 1);   if(i < j)   {        c = s[i];        s[i] = s[j];        s[j] = c;        reverse(s,++i,len);   }}int main(){    char s[100] = "I love you!";    reverse(s,0,strlen(s));    printf("%s\n",s);    return 0;}