Fix double slash (#1309)
Fix double slash (#1309)


Microsoft/pxt,Microsoft/pxt,switch-education/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt,playi/pxt,switch-education/pxt,switchinnovations/pxt,playi/pxt,playi/pxt,switchinnovations/pxt,switchinnovations/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt