[Rust-Axum] Support quotes in string literals (#20176)

* Allow quotes in string literals

* Update samples

Author: Victoria-Casasampere-BeeTheData

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustAxumServerCodegen.java

@@ -809,7 +809,7 @@ public String toDefaultValue(final Schema p) {
             }
         } else if (ModelUtils.isStringSchema(p)) {
             if (p.getDefault() != null) {
-                defaultValue = "\"" + p.getDefault() + "\".to_string()";
+                defaultValue = "r#\"" + p.getDefault() + "\"#.to_string()";
             }
         }
 

samples/server/petstore/rust-axum/output/openapi-v3/src/models.rs

@@ -1827,7 +1827,7 @@ impl NullableTest {
         NullableTest {
             nullable,
             nullable_with_null_default: None,
-            nullable_with_present_default: Some(Nullable::Present("default".to_string())),
+            nullable_with_present_default: Some(Nullable::Present(r#"default"#.to_string())),
             nullable_with_no_default: None,
             nullable_array: None,
             min_item_test: None,

samples/server/petstore/rust-axum/output/petstore-with-fake-endpoints-models-for-testing/src/models.rs

@@ -309,7 +309,7 @@ impl Animal {
     pub fn new(class_name: String) -> Animal {
         Animal {
             class_name,
-            color: Some("red".to_string()),
+            color: Some(r#"red"#.to_string()),
         }
     }
 }
@@ -1460,7 +1460,7 @@ impl Cat {
     pub fn new(class_name: String) -> Cat {
         Cat {
             class_name,
-            color: Some("red".to_string()),
+            color: Some(r#"red"#.to_string()),
             declawed: None,
         }
     }
@@ -2041,7 +2041,7 @@ impl Dog {
     pub fn new(class_name: String) -> Dog {
         Dog {
             class_name,
-            color: Some("red".to_string()),
+            color: Some(r#"red"#.to_string()),
             breed: None,
         }
     }
@@ -5858,7 +5858,7 @@ impl TestEnumParametersRequest {
     #[allow(clippy::new_without_default, clippy::too_many_arguments)]
     pub fn new() -> TestEnumParametersRequest {
         TestEnumParametersRequest {
-            enum_form_string: Some("-efg".to_string()),
+            enum_form_string: Some(r#"-efg"#.to_string()),
         }
     }
 }