Two similar parameters/attributes are generated with the same name (clashing names)

Description

The generator is creating clashing local variable names when two different parameters cause a naming clash (i.e., company_name and companyName both generate companyName whereas are different from the API perspective).

Swagger-codegen version

3.0.24

Swagger declaration file content or url

https://interactivebrokers.github.io/cpwebapi/swagger.json

Attached is the json converted to yaml (v3).
ib.zip

Command line used for generation

Using maven generator with the following:

<plugin>
                <groupId>io.swagger.codegen.v3</groupId>
                <artifactId>swagger-codegen-maven-plugin</artifactId>
                <version>3.0.24</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/src/main/resources/ib.yaml</inputSpec>
                            <language>java</language>
                            <modelPackage>test.model</modelPackage>
                            <apiPackage>test.api</apiPackage>
                            <invokerPackage>test.api</invokerPackage>
                            <checkDuplicatedModelName>true</checkDuplicatedModelName>
                            <configOptions>
                                <library>feign</library>
                                <serializableModel>true</serializableModel>
                                <dateLibrary>java8</dateLibrary>
                                <java8>true</java8>  
                                <ensureUniqueParams>true</ensureUniqueParams>                              
                                <checkDuplicatedModelName>true</checkDuplicatedModelName>
                            </configOptions>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

Steps to reproduce

Just download the URL and run the CLI or maven plugin. See the file Contract (test.Contract).

Related issues/PRs

Suggest a fix/enhancement

I don't know the project enough to suggest much, but perhaps a quick check of attributes can be done and rename those that already exist before generation.

Note: I know I could change the code after generation, but that means commenting out the section in pom.xml once is generated, and if there is a mistake, then the nightmare starts.

Thanks!

Juan

Reproduce the clash using the attached ib.yaml through the CLI or Maven plugin, then inspect the generated test.Contract output and the Java generator's parameter-naming path. Done means company_name and companyName produce distinct local names and the generated Contract compiles without manual edits.