#include <string.h>
char *strpbrk(char *s1, const char *s2);

finds the first occurrence of a character.

#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */
 
#include <string.h>
 
int main( void ) {
    char string1[]="You can help with your experience to improve this page";
    char string2[]="help";
 
    printf("So please %s\n", strpbrk( string1, string2 ) );
    return 0;
}

Output:

  user@host:~$ ./strpbrk 
  So please help with your experience to improve this page
      

on the occasion of the current invasion of Russia in Ukraine