feat(math): introduce lcm function

math/lcm.jule

@@ -0,0 +1,16 @@
+fn LCM(a: int, b: int): int {
+	if a == 0 || b == 0 {
+		return 0
+	}
+
+	let mut x = a
+	if x < 0 {
+		x = -x
+	}
+	let mut y = b
+	if y < 0 {
+		y = -y
+	}
+
+	return (x / GCD(x, y)) * y
+}

math/lcm_test.jule

@@ -0,0 +1,12 @@
+#build test
+
+use "std/testing"
+
+#test
+fn testLCM(t: &testing::T) {
+	t.Assert(LCM(0, 7) == 0, "lcm of zero and 7 should be 0")
+	t.Assert(LCM(4, 6) == 12, "lcm of 4 and 6 should be 12")
+	t.Assert(LCM(21, 6) == 42, "lcm of 21 and 6 should be 42")
+	t.Assert(LCM(-8, 12) == 24, "lcm should be positive for negative inputs")
+	t.Assert(LCM(-9, -6) == 18, "lcm should be positive for two negatives")
+}