code: public static int[] append(int[] lhs, int[] rhs) {
  		int[] rs = java.util.Arrays.copyOf(lhs, lhs.length + rhs.length);
  		System.arraycopy(rhs, 0, rs, lhs.length, rhs.length);
  		return rs;
  	}
docs: Append two arrays of integer type together, producing a fresh array whose
  length equals that of the first and second added together.
  
  @param lhs
  The left-hand side. Elements of this array will be copied
  first into the resulting array.
  @param rhs
  The right-hand side. Elements of this array will be copied
  last into the resulting array.
  @return