feat: ✨ change nickname on verify

Author: vidhanio

command_verify.go

@@ -1,6 +1,7 @@
 package checkpoint
 
 import (
+	"fmt"
 	"strings"
 
 	"github.com/bwmarrin/discordgo"
@@ -50,6 +51,13 @@ func (c *Checkpoint) verify(s *discordgo.Session, i *discordgo.InteractionCreate
 		return
 	}
 
+	err = c.session.GuildMemberNickname(i.GuildID, i.Member.User.ID, fmt.Sprintf("%s %b.", firstName, lastName[0]))
+	if err != nil {
+		errorRespond(s, i, err)
+
+		return
+	}
+
 	if g.GradeRoles[grade-1] == "" {
 		return
 	}