Example: Given s = "hello", return "olleh".
char* reverseString(char* s) {
char *start = s;
char *end = s + strlen(s) - 1; // 注意这里 -1，比如 s = "abc\0", strlen(s)=3, s+3 ---> '\0';
while(start < end) { // 无需验证 s 是否为 NULL
char tmp = *start;
*start = *end;
*end = tmp;
start++;
end--;
}
return s;
}
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本文标题：344. Reverse string
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