src/main/java/wycc/util/ArrayUtils.java
public static int[] append(int lhs, int[] rhs) {
		int[] rs = new int[rhs.length+1];
		rs[0] = lhs;
		System.arraycopy(rhs, 0, rs, 1, rhs.length);
		return rs;
	}
public static int[] append(int lhs, int[] rhs) {
		int[] rs = new int[rhs.length+1];
		rs[0] = lhs;
		System.arraycopy(rhs, 0, rs, 1, rhs.length);
		return rs;
	}
Append an integer item to the front of an array of integer type together,
producing a fresh array whose length equals that the second plus one.

@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