UIT 8.09

int myStrcmp(char s1[], char s2[]){
    int len1 = 0, len2 = 0;
    while (s1[len1]!='\0') len1++;
    while (s2[len2]!='\0') len2++;
    if (len1<len2) return -1;
    if (len1>len2) return 1;
    for(int i=0; i<len1; i++){
        if (s1[i]>s2[i]) return 1;
        if (s1[i]<s2[i]) return -1;
    }
    return 0;
}