Refactor api code: split between packages

internal/mapper/usersignup.go

@@ -0,0 +1,20 @@
+package mapper
+
+import (
+	"git.artlef.fr/PersonalLibraryManager/internal/dto"
+	"git.artlef.fr/PersonalLibraryManager/internal/model"
+	"golang.org/x/crypto/bcrypt"
+)
+
+func UserWsToDb(u dto.UserSignup) (model.User, error) {
+	user := model.User{
+		Name:     u.Username,
+		Password: "",
+	}
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
+	if err != nil {
+		return user, err
+	}
+	user.Password = string(hashedPassword)
+	return user, nil
+}