void StrOL(void)
{
    int n1;
    int len;
    char *p1,*p2;
    char t1[80],t2[80];
    for(n1=0;n1<maxline;n1++)
    {
        len=strlen(xx[n1]);
        t1[0]=t2[0]='\0';
        p1=&xx[n1][len-1];
        p2=&xx[n1][len-1];
        while(1)
        {
            while(isalpha(*p1)==0)
            {
                p1--;
                if(p1<xx[n1])
                    break;
            }
            if(p1<xx[n1])
                break;
            p2=p1;
            while(isalpha(*p1))
                p1--;
            memcpy(t2,p1+1,p2-p1);
            t2[p2-p1]='\0';
            strcat(t1,t2);
            strcat(t1," ");
            if(p1<xx[n1])
                break;
        }
        strcpy(xx[n1],t1);
    }
}

看看好了没有

非常感谢！我知道是什么问题了，遍得不够严谨啊。
谢谢！