Add bin and edit workflow

bin/gems/facets-3.1.0/lib/standard/facets/math/lcm.rb

@@ -0,0 +1,15 @@
+module Math
+
+  # Least common multiple of +m+ and +n+, computed by multiplying
+  # +m+ and +n+ and dividing the product by the gcd of +m+ and +n+,
+  # +nil+ for non-positive numbers.
+  def self.lcm(m, n)
+    m = Integer(m)
+    n = Integer(n)
+    if m <= 0 || n <= 0
+      return nil
+    end
+    m / gcd(m, n) * n
+  end
+
+end