chore: fix linting issues

Author: omissis

pkg/generator/schema_generator.go

@@ -9,7 +9,7 @@ import (
 	"github.com/atombender/go-jsonschema/pkg/schemas"
 )
 
-var errCannotSupportMultipleTypesForAdditionalProperties = errors.New("cannot support multiple types for additional properties")
+var errTooManyTypesForAdditionalProperties = errors.New("cannot support multiple types for additional properties")
 
 type schemaGenerator struct {
 	*Generator
@@ -535,10 +535,10 @@ func (g *schemaGenerator) generateStructType(
 		structType.AddField(structField)
 	}
 
-	// checking .Not here because `false` is unmarshalled to .Not = Type{}
+	// Checking .Not here because `false` is unmarshalled to .Not = Type{}.
 	if t.AdditionalProperties != nil && t.AdditionalProperties.Not == nil {
 		if len(t.AdditionalProperties.Type) > 1 {
-			return nil, errCannotSupportMultipleTypesForAdditionalProperties
+			return nil, errTooManyTypesForAdditionalProperties
 		}
 
 		var (
@@ -554,30 +554,35 @@ func (g *schemaGenerator) generateStructType(
 					KeyType:   codegen.PrimitiveType{Type: "string"},
 					ValueType: codegen.PrimitiveType{Type: "string"},
 				}
+
 			case schemas.TypeNameArray:
 				defaultValue = map[string][]any{}
 				fieldType = codegen.MapType{
 					KeyType:   codegen.PrimitiveType{Type: "string"},
 					ValueType: codegen.ArrayType{Type: codegen.EmptyInterfaceType{}},
 				}
+
 			case schemas.TypeNameNumber:
 				defaultValue = map[string]float64{}
 				fieldType = codegen.MapType{
 					KeyType:   codegen.PrimitiveType{Type: "string"},
 					ValueType: codegen.PrimitiveType{Type: "float64"},
 				}
+
 			case schemas.TypeNameInteger:
 				defaultValue = map[string]int{}
 				fieldType = codegen.MapType{
 					KeyType:   codegen.PrimitiveType{Type: "string"},
 					ValueType: codegen.PrimitiveType{Type: "int"},
 				}
+
 			case schemas.TypeNameBoolean:
 				defaultValue = map[string]bool{}
 				fieldType = codegen.MapType{
 					KeyType:   codegen.PrimitiveType{Type: "string"},
 					ValueType: codegen.PrimitiveType{Type: "bool"},
 				}
+
 			default:
 				defaultValue = map[string]any{}
 				fieldType = codegen.MapType{