strlen

int fStrStr(char* str, char* strSub)
{
    int i=0, j=0;
    int nTemp = i;
    int nStrLen = 0, nStrSubLen;
    char checker;

    do{
        checker = str[nStrLen];
        nStrLen ++;
    } while(checker != '\0');
    checker = ' ';

    do{
        checker = str[nStrSubLen];
        nStrSubLen ++;
    } while(checker != '\0');


    for(i=0; i<nStrLen-nStrSubLen; i++)
    {
        nTemp = i;
        for(j=0; j<nStrSubLen; j++)
        {

            if(str[nTemp]==strSub[j])
            {
                if(j==nStrSubLen-1)
                    return 1;
                nTemp++;
            }
            else
                break;
        }
    }
    return 0;
}