Space Replacement

public class Solution {
    /**
     * @param string: An array of Char
     * @param length: The true length of the string
     * @return: The true length of new string
     */
    public static int replaceBlank(char[] string, int length) {
        if (string == null || string.length == 0){
            return 0;
        }
        int blank = 0;
        int len = string.length;
        for (char aString : string) {
            if (Character.isSpaceChar(aString)) {
                blank++;
            }
        }
        int result = len + blank * 2 - 1;
        char[] string1 = new char[result + 1];
        for (int i = len - 1; i >= 0; i--){
            if (!Character.isSpaceChar(string[i])){
                string1[result--] = string[i];
            } else {
                string1[result--] = '0';
                string1[result--] = '2';
                string1[result--] = '%';
            }
        }
        return len + blank * 2;
    }
}