feat: add release command

Add the release command to release a Pokemon back into the wild.

internal/commands/release.go

@@ -0,0 +1,38 @@
+package commands
+
+import (
+	"errors"
+	"fmt"
+
+	"codeflow.dananglin.me.uk/apollo/pokedex/internal/poketrainer"
+)
+
+func ReleaseFunc(trainer *poketrainer.Trainer) CommandFunc {
+	return func(args []string) error {
+		if args == nil {
+			return errors.New("the name of the Pokemon has not been specified")
+		}
+
+		if len(args) != 1 {
+			return fmt.Errorf(
+				"unexpected number of Pokemon names: want 1; got %d",
+				len(args),
+			)
+		}
+
+		pokemonName := args[0]
+
+		if _, caught := trainer.GetPokemonFromPokedex(pokemonName); !caught {
+			return fmt.Errorf(
+				"you haven't caught a %s",
+				pokemonName,
+			)
+		}
+
+		trainer.RemovePokemonFromPokedex(pokemonName)
+
+		fmt.Printf("%s was released back into the wild.\n", pokemonName)
+
+		return nil
+	}
+}

internal/poketrainer/trainer.go

@@ -48,6 +48,10 @@ func (t *Trainer) GetPokemonFromPokedex(name string) (pokeapi.Pokemon, bool) {
 	return details, ok
 }
 
+func (t *Trainer) RemovePokemonFromPokedex(name string) {
+	delete(t.pokedex, name)
+}
+
 func (t *Trainer) ListAllPokemonFromPokedex() {
 	if len(t.pokedex) == 0 {
 		fmt.Println("You have no Pokemon in your Pokedex.")

main.go

@@ -63,6 +63,10 @@ func run() {
 			description: "List the names of all the Pokemon in your Pokedex",
 			callback:    commands.PokedexFunc(trainer),
 		},
+		"release": {
+			description: "Release a Pokemon back into the wild",
+			callback:    commands.ReleaseFunc(trainer),
+		},
 		"visit": {
 			description: "Visit a location area",
 			callback:    commands.VisitFunc(client, trainer),