Standardized package comment, correct Sca logic

triangle.go

@@ -1,4 +1,4 @@
-// Package triangle: Determine what kind of triangle three side lengths make.
+// Package triangle determines what kind of triangle three side lengths make.
 package triangle
 
 import "math"
@@ -33,7 +33,7 @@ func KindFromSides(a, b, c float64) (k Kind) {
 		k = Equ
 	case a == b || b == c || a == c: // 2 equal length sides (Iso)
 		k = Iso
-	case a != b || b != c || a != c: // No equal length sides (Sca)
+	case a != b && b != c && a != c: // No equal length sides (Sca)
 		k = Sca
 	}
 	return k