[BUG] `std::option::Option<&str>` cannot be formatted with the default formatter

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

I'm using the rust generator to generate a client for our kubernetes API server.

The generated client code fails to compile with:

error[E0277]: `std::option::Option<&str>` doesn't implement `std::fmt::Display`
    --> kubernetes-client/src/apis/core_v1_api.rs:3872:67
     |
3872 |     let local_var_uri_str = format!("{}/api/v1/nodes/{name}/proxy/{path}", local_var_configuration.base_path, name=crate::apis::urlencode(name));
     |                                                                   ^^^^^^ `std::option::Option<&str>` cannot be formatted with the default formatter

The generated code:

/// connect POST requests to proxy of Node
pub async fn connect_core_v1_post_node_proxy_with_path(configuration: &configuration::Configuration, name: &str, path: Option<&str>) -> Result<String, Error<ConnectCoreV1PostNodeProxyWithPathError>> {
    let local_var_configuration = configuration;

    let local_var_client = &local_var_configuration.client;

    let local_var_uri_str = format!("{}/api/v1/nodes/{name}/proxy/{path}", local_var_configuration.base_path, name=crate::apis::urlencode(name));
    let mut local_var_req_builder = local_var_client.request(reqwest::Method::POST, local_var_uri_str.as_str());
   
    // ...
}

openapi-generator version

Happens on:

• 7.10.0
• 7.11.0-SNAPSHOT

OpenAPI declaration file content or url

Can't share but it is a Kubernetes OpenAPI V2 spec.

Generation Details

docker run --rm --network=host -v ${PWD}:/local openapitools/openapi-generator-cli \
    generate \
    -i https://apiserver/openapi/v2 \
    -g rust \
    -o /local \
    --additional-properties=packageName=kubernetes-client,packageVersion=0.1.0

Steps to reproduce

Related issues/PRs

• https://github.com/OpenAPITools/openapi-generator/issues/16975

Suggest a fix

Perhaps the last part of the URL /{path} or just {path} (not the slash) should be left off if path is None.

Start by reproducing the reported failure with the Rust generator and inspect the generated URI formatting for the optional path parameter, particularly the generated core_v1_api.rs example. Done means the generated Rust client handles path: None correctly and compiles without the Option<&str> formatting error.