diff --git a/behavior/19_interpreter/README.md b/behavior/07_interpreter/README.md
similarity index 100%
rename from behavior/19_interpreter/README.md
rename to behavior/07_interpreter/README.md
diff --git a/behavior/19_interpreter/interpreter.go b/behavior/07_interpreter/interpreter.go
similarity index 100%
rename from behavior/19_interpreter/interpreter.go
rename to behavior/07_interpreter/interpreter.go
diff --git a/behavior/19_interpreter/interpreter_test.go b/behavior/07_interpreter/interpreter_test.go
similarity index 100%
rename from behavior/19_interpreter/interpreter_test.go
rename to behavior/07_interpreter/interpreter_test.go