字符串的复制,长度计算,单词反序输出

//实现字符串的复制
void strcpytwo(char b[],char a[])
{
    int i = 0;
    while (a[i] != '\0'){
        b[i] = a[i];
        i++;
    }
}
//实现字符串长度的计算
int strlentwo(char a[])
{
    int i = 0;
    while (a[i] != '\0') {
        i++;
    }
    return i;
}
//实现单词的反序输出
void antitone(char str[])
{
    int i = 0;
    int count = 0;
    int b[20] = {};
    while (str[i] != '\0') {
        if (str[i] != ' ') {
            count ++;
            if (str[i + 1] == ' ' || str[i + 1] == '\0') {
                b[i] = count;
                count = 0;
            }
        }
        i ++;
    }
    for (int i = 19; i >= 0; i --) {
        if (b[i] != 0) {
            for (int j = i - b[i] + 1 ;j < i + 1 ; j ++) {
                printf("%c",str[j]);
            }
            printf(" ");
        }
    }
}