boolean, sizeofstring: update after talking with x/tools folks

boolean/boolean_test.go

@@ -1,11 +1,11 @@
-// boolean.go
-package bocchi
+// boolean_test.go
+package bocchi_test
 
 import "git.sunturtle.xyz/zephyr/errors-my-beloved/boolean/challenge"
 
 var _ = map[bool]struct{}{
 	false:                      {},
-	challenge.Flag == "gc25{}": {}, // ERROR: ./boolean.go:7:2: duplicate key false in map literal
+	challenge.Flag == "gc25{}": {}, // ERROR: ./boolean_test.go:7:2: duplicate key false in map literal
 }
 
 var _ = map[bool]struct{}{