Add make docker target

Signed-off-by: Alexey Palazhchenko <[email protected]>

Author: AlekSi

Makefile

@@ -7,6 +7,9 @@ help:                        ## Display this help message.
 	@grep '^[a-zA-Z]' $(MAKEFILE_LIST) | \
 		awk -F ':.*?## ' 'NF==2 {printf "  %-20s%s\n", $$1, $$2}'
 
+docker:
+	docker run -it -v $(PWD):/workshop -w /workshop ghcr.io/aleksi/golang-tip:dev.fuzz /bin/bash
+
 init:                        ## Install tools.
 	go generate -x -tags=tools ./tools
 	make build

reverse.go

@@ -1,6 +1,10 @@
 package pb_fuzz_workshop
 
 func Reverse(s []int) []int {
+	if s == nil {
+		return nil
+	}
+
 	a := make([]int, len(s))
 	copy(a, s)