diff --git a/interfaces/12-reflection-decoder/_decoder_reader.go b/interfaces/reflection-decoder/_decoder_reader.go
similarity index 100%
rename from interfaces/12-reflection-decoder/_decoder_reader.go
rename to interfaces/reflection-decoder/_decoder_reader.go
diff --git a/interfaces/12-reflection-decoder/_main.go b/interfaces/reflection-decoder/_main.go
similarity index 100%
rename from interfaces/12-reflection-decoder/_main.go
rename to interfaces/reflection-decoder/_main.go
diff --git a/interfaces/12-reflection-decoder/_main_reader.go b/interfaces/reflection-decoder/_main_reader.go
similarity index 100%
rename from interfaces/12-reflection-decoder/_main_reader.go
rename to interfaces/reflection-decoder/_main_reader.go
diff --git a/interfaces/12-reflection-decoder/book.go b/interfaces/reflection-decoder/book.go
similarity index 100%
rename from interfaces/12-reflection-decoder/book.go
rename to interfaces/reflection-decoder/book.go
diff --git a/interfaces/12-reflection-decoder/database.go b/interfaces/reflection-decoder/database.go
similarity index 100%
rename from interfaces/12-reflection-decoder/database.go
rename to interfaces/reflection-decoder/database.go
diff --git a/interfaces/12-reflection-decoder/database.json b/interfaces/reflection-decoder/database.json
similarity index 100%
rename from interfaces/12-reflection-decoder/database.json
rename to interfaces/reflection-decoder/database.json
diff --git a/interfaces/12-reflection-decoder/game.go b/interfaces/reflection-decoder/game.go
similarity index 100%
rename from interfaces/12-reflection-decoder/game.go
rename to interfaces/reflection-decoder/game.go
diff --git a/interfaces/12-reflection-decoder/list.go b/interfaces/reflection-decoder/list.go
similarity index 100%
rename from interfaces/12-reflection-decoder/list.go
rename to interfaces/reflection-decoder/list.go
diff --git a/interfaces/12-reflection-decoder/main.go b/interfaces/reflection-decoder/main.go
similarity index 100%
rename from interfaces/12-reflection-decoder/main.go
rename to interfaces/reflection-decoder/main.go
diff --git a/interfaces/12-reflection-decoder/money.go b/interfaces/reflection-decoder/money.go
similarity index 100%
rename from interfaces/12-reflection-decoder/money.go
rename to interfaces/reflection-decoder/money.go
diff --git a/interfaces/12-reflection-decoder/product.go b/interfaces/reflection-decoder/product.go
similarity index 100%
rename from interfaces/12-reflection-decoder/product.go
rename to interfaces/reflection-decoder/product.go
diff --git a/interfaces/12-reflection-decoder/puzzle.go b/interfaces/reflection-decoder/puzzle.go
similarity index 100%
rename from interfaces/12-reflection-decoder/puzzle.go
rename to interfaces/reflection-decoder/puzzle.go
diff --git a/interfaces/12-reflection-decoder/timestamp.go b/interfaces/reflection-decoder/timestamp.go
similarity index 100%
rename from interfaces/12-reflection-decoder/timestamp.go
rename to interfaces/reflection-decoder/timestamp.go
diff --git a/interfaces/12-reflection-decoder/toy.go b/interfaces/reflection-decoder/toy.go
similarity index 100%
rename from interfaces/12-reflection-decoder/toy.go
rename to interfaces/reflection-decoder/toy.go