下列函数kmp实现串的模式匹配，请在空格处将算法补充完整。int kmp(sqstring *s,sqstring *t,int start,int next[]){int i=start-1,j=0;while(ilen&&jlen)if(j==-1||s->data[i]==t->data[j]){i++;j++;}else j= ;if(j>=t->len)return( );elsereturn(-1);}