src/main/java/wycc/util/ArrayUtils.java
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;
	}
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;
	}
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