#include<stdio.h>
#include<string.h>

 int is_in_f(char *s, char c) {
 while(*s) {
    if(*s==c) return 1;
    else s++;
}
return 0;
}

int main() {
char *name = "paria llls";
char string1[] = "a";
if(is_in_f(*name, string1)){
    printf("found");
}

return 0;
}

E2.c: In function ‘main’:
 E2.c:14:19: warning: passing argument 2 of ‘is_in_f’ makes integer from          pointer without a cast [-Wint-conversion]
  if(is_in_f(name, string1)){
               ^~~~~~~
E2.c:3:5: note: expected ‘char’ but argument is of type ‘char *’
int is_in_f(char *s, char c) {