#include <stdio.h>

int find_first_char(char *str, char find)
{
  int i=0;
  while(str[i] != '\0') {
    if (str[i] == find) {
      return(i);
    }
    i++;
  }
  return(-1);
}

int main(void)
{
  int res;
  char str[] = "test";
  res = find_first_char(str, 'e');
  printf("res is %d\n", res);
  return(0);
}