[Solved] Recursive function to reverse find [closed]

Here’s a pretty straight forward recursive implementation. Sadly, it’s not tail recursive though.

Full Implementation:

char *rfind(char* str, char ch) { 
     if (*str == '\0')
         return NULL; 
     char * pos = rfind(str + 1, ch);
     if (pos != NULL)
         return pos;
     if (*str == ch)
         return str;
     return NULL;
}

Base Case: str is a string of zero characters:

     if (*str == '\0')
         return NULL; 

Recursive Call:

     char * pos = rfind(str + 1, ch);

Determine if we want the result of the remainder of the string, or the current position:

     if (pos != NULL)
         return pos;
     if (*str == ch)
         return str;
     return NULL;