remove unused controller actions

app/controllers/users_controller.rb

@@ -1,53 +1,7 @@
 class UsersController < ApplicationController
-  before_action :set_user, only: %i[ show update destroy ]
-
-  # GET /users
-  # GET /users.json
-  def index
-    @users = User.all
-  end
-
   # GET /users/1
   # GET /users/1.json
   def show
+    @user = User.find(params[:id])
   end
-
-  # POST /users
-  # POST /users.json
-  def create
-    @user = User.new(user_params)
-
-    if @user.save
-      render :show, status: :created, location: @user
-    else
-      render json: @user.errors, status: :unprocessable_entity
-    end
-  end
-
-  # PATCH/PUT /users/1
-  # PATCH/PUT /users/1.json
-  def update
-    if @user.update(user_params)
-      render :show, status: :ok, location: @user
-    else
-      render json: @user.errors, status: :unprocessable_entity
-    end
-  end
-
-  # DELETE /users/1
-  # DELETE /users/1.json
-  def destroy
-    @user.destroy
-  end
-
-  private
-    # Use callbacks to share common setup or constraints between actions.
-    def set_user
-      @user = User.find(params[:id])
-    end
-
-    # Only allow a list of trusted parameters through.
-    def user_params
-      params.require(:user).permit(:username)
-    end
 end