【leetcode】1455. 检查单词是否为句中其他单词的前缀

int isPrefixOfWord(char * sentence, char * searchWord){
    char* buffer;
    int pst=1;
    buffer=strtok(sentence," ");
    while(buffer){
        if(strstr(buffer,searchWord)==buffer)
            return pst;
        buffer=strtok(NULL," ");
        pst++;
    }
    return -1;
}