fix path joining logic

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

core/path.go

@@ -135,6 +135,12 @@ func joinSanitizedPaths(start, end string) string {
 			end = ""
 		}
 	default:
+		// Trim any leading '/'
+		if end[0] == '/' {
+			end = end[1:]
+			endLen--
+		}
+
 		// Trim any trailing '/'
 		if end[endLen-1] == '/' {
 			end = end[:endLen-1]
@@ -148,13 +154,12 @@ func joinSanitizedPaths(start, end string) string {
 	case "/":
 		return start + end
 	default:
-		// Ensure no final '/'
-		length := len(start)
-		if start[length-1] == '/' {
-			start = start[:length-1]
+		// Ensure there is a path separator
+		// between the final path component of
+		// start, and the beginning of end
+		if start[len(start)-1] == '/' {
+			return start + end
 		}
-
-		// Return joined strings
 		return start + "/" + end
 	}
 }