[BUG] C client generator cannot generate petstore label:"Client: C"

[michelealbano]

Bug Report Checklist

• [ X ] Have you provided a full/minimal spec to reproduce the issue?
• [ X ] Have you validated the input using an OpenAPI validator (example)?
• [ X ] What's the version of OpenAPI Generator used?
• [ X ] Have you search for related issues/PRs?
• [ X] What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Current C client generator cannot generate correctly code for petstore.yaml (modules/openapi-generator/src/test/resources/3_0/petstore.yaml)

Description

Generate code for modules/openapi-generator/src/test/resources/3_0/petstore.yaml cannot compile. When tweaked manually, the test code does not compile.

openapi-generator version

Current master.

OpenAPI declaration file content or url

modules/openapi-generator/src/test/resources/3_0/petstore.yaml

Command line used for generation

java -jar ../openapi-generator/modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g c -i ../openapi-generator/modules/openapi-generator/src/test/resources/3_0/petstore.yaml

Steps to reproduce

mkdir build
cd build
cmake ..
make

Related issues/PRs

maybe issue #5735

Suggest a fix

I found a number of issues with current code. I am providing a PR.

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