344. Reverse String

344. Reverse String

code:

char* reverseString(char* s) {char *p1, *p2;if (!s || !*s)    return s;for (p1 = s, p2 = s+strlen(s)-1; p1 < p2; p1++, p2--) {    *p1 ^= *p2;    *p2 ^= *p1;    *p1 ^= *p2;}return s;}