Complete this method

/**
* Reduces all sequences of 2 or more spaces to 1 space within the
* characters array. If any spaces are removed then the same number
* of Null character '\u0000' will fill the elements at the end of the
* array.
*
* @param characters The series of characters that may have more than one
*     space in a row when calling. On return the array of characters will
*     not have more than one space in a row and there may be '\u0000'
*     characters at the end of the array.
*/
public static void removeDuplicateSpaces(char[] characters) {

	for (int i = 0; i < characters.length - 1; i++) {
		if (characters[i] == ' ' && characters[i + 1] == ' ') {
			int k = i + 1;
			int n = 0;
			char j='\u0000';
			while (n<characters.length-1){>
				for (k=i+1; k < characters.length-1; k++){
					if (characters[k]==' '){
						characters[k]=j;
					}
					for ( int l = 0; l < characters.length-1;l++){
						characters[l]=characters[l+1];
					}
				}
				n++;
			}
		}
	}