text: /*  Exercise 2-5
      Write the function any(s1,s2), which returns the first location in the string s1 where any character from the string s2 occurs, or −1 if s1 contains no characters from s2. (The standard library function strpbrk does the same job but returns a pointer to the location.)
  */
  #include <stdio.h>
  #include "main.h"
  
  int any(char s1[], char s2[]) {
      int i, j;
      for (i = 0; s1[i] != '\0'; i++) {
          for (j = 0; s2[j] != '\0'; j++) {
              if (s1[i] == s2[j]) 
                  return i;
          }
      }
      return -1;
  }