public boolean validPalindrome(String s) {

char[] chars = s.toCharArray();

int start = 0;

int end = chars.length-1;

boolean flag = true;

while(start < end)

{

if(chars[start] == chars[end])

{

start++;

end--;

}else if(!flag){

break;

}

else if(s.length()>=4&&chars[start+1] == chars[end]&& chars[start] == chars[end-1])

{

if((chars[start+1] == chars[end]&& chars[start+2] == chars[end-1]))

{

start++;

flag=false;

}else if((chars[start] == chars[end-1]&& chars[start+1] == chars[end-2]))

{

end--;

flag = false;

}

}

else if(chars[start+1] == chars[end]){

start = start+1;

flag = false;

}else if(chars[start] == chars[end-1]){

end = end - 1;

flag = false;

}else{

return false;

}

}

return true;

}