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// C

bool isPalindrome(char *s) {

int bias_left = 0;

int bias_right = 1;

int str_len = strlen(s);

for (int i = 0; i < str_len; i++) {

// 스킵 포인터 처리

while (!isalnum(s[i + bias_left])) {

bias_left++;

if (i + bias_left == str_len)

return true;

}

while (!isalnum(s[str_len - i - bias_right])) {

bias_right++;

}

if (i + bias_left >= str_len - i - bias_right)

break;

// 팰린드롬 비교

if (tolower(s[i + bias_left]) != tolower(s[str_len - i - bias_right]))

return false;

}

return true;

}