#include <stdio.h>

int str_conteudo( char str1[], char str2[]) {
	int i=0,j,k;
	for(i = 0; str1[i] != '\0'; ++i) {
        for (j = i,k = 0;str1[j]!= '\0' && str2[k] != '\0' && str1[j] == str2[k]; ++j,k++);
        if (str2[k] == '\0'){
            return i;
        }
	}
    return -1;
}

int main(int argc, char *argv[]) {

    printf("%d\n", str_conteudo ("Frase de teste","de"));
    printf("%d\n", str_conteudo ("Frase de teste","teste"));
    printf("%d\n", str_conteudo ("Frase de teste","Frase"));
    printf("%d\n", str_conteudo ("Frase de teste","cuFra"));
    printf("%d\n", str_conteudo ("Frase de teste","testem"));

	return 0;
}