题目：

题解：

void myResverse(char* s,int start,int end){
    while(start<end){
        char temp = s[start];
        s[start] = s[end];
        s[end] = temp;
        start++;
        end--;
    }
}
char* reverseWords(char* s) {
    int start = 0;
    int end = strlen(s)-1;
    myResverse(s,start,end);
    if(s[0]==' '){
        int i = 0;
        while(s[i]==' '){
            i++;
        }
        int j = 0;
        while(s[i]!='\0'){
            s[j] = s[i];
            i++;
            j++;
        }
        s[j] = '\0';
    }
    int check = 0;
    while(s[check]!='\0'){
        check++;
    }
    if(s[check-1]==' '){
        int o = check - 1;
        while(s[o]==' '){
            o--;
        }
        s[o+1] = '\0';
    }
    for(int k = 0;k<strlen(s);k++){
        if(s[k]==' '&&s[k+1]==' '){
            int i = k;
        while(s[i]==' '){
            i++;
        }
        int j = k+1;
        while(s[i]!='\0'){
            s[j] = s[i];
            i++;
            j++;
        }
        s[j] = '\0';
        }
    }
    int slow = 0;
    for(int u = 0;u<=strlen(s);u++){
        if(s[u]==' '||s[u]=='\0'){
            myResverse(s,slow,u-1);
            slow = u+1;
        }
    }
    return s;
}