#include <stdio.h>

char *str_char(char *s, int c) {
    for ( ; *s; s++) {
        if (*s==c) {
            return s;
        }
    }
    return NULL;
}

int main(void) {
    char *ptr;
    char fox[] = "The quick brown fox jumps over the lazy dog.";

    ptr = str_char(fox, 'z');
    if (ptr) {
        printf("%s\n", ptr);
    }

    return 0; 
}