leetcode/344. Reverse String

//Write a function that takes a string as input and returns the string reversed.
//Example:
//Given s = “hello”, return “olleh”.

char* reverseString(char* s) {    int len = (int)strlen(s); //获取字符串长度，xcode中提示strlen()返回的是long类型，强制转换成int    char* p = (char*)malloc(len+1); //创建目标字符串，分配内存len+1，放置最后\0    for(int i = len-1; i >= 0; i--) { //此处用i++顺序方式，leetcode出错，原因不明        p[len-1-i] = s[i]; //可以用*(s+i)    }    p[len] = 0; //把字符最后一个0 补上    return p;}