[JAVA + feign] Camel case logic for Feign client generation generates wrong code with more than one path variable

Description

Camel case logic for Feign client generation generates wrong code with more than one path variable.

A path like /customers/{customerEntity}-{customerNumber} will generate @RequestLine("GET /customers/{customerEntity}{customerNumber}") (note the missing dash).

Was introduced in https://github.com/swagger-api/swagger-codegen/commit/2e8eea9c1832735babc7eb499bceaa3e43b79a51

Swagger-codegen version

since https://github.com/swagger-api/swagger-codegen/commit/2e8eea9c1832735babc7eb499bceaa3e43b79a51

Swagger declaration file content or url

Command line used for generation

def contract = "$rootDir/contracts/client/service.yaml"
def targetPackage = "com.xxx"

def config = new io.swagger.codegen.config.CodegenConfigurator()
config.setTemplateDir(file('gradle/swagger-generator-templates/java-client').path)
config.setInputSpec(contract)
config.setOutputDir(file('build/generated-sources/swagger').path)
config.setLang('java')
config.setAdditionalProperties([
        'library'                 : "feign",
        'java8'                   : 'true',
        'modelPackage'            : "${targetPackage}.model".toString(),
        'apiPackage'              : "${targetPackage}.api".toString(),
        'generateModels'          : true,
        'generateApiDocumentation': true,
        'generateSupportingFiles' : false,
        'generateApiTests'        : true,
        'dateLibrary'             : 'java8',
        'bigDecimalAsString'      : true
])

Steps to reproduce

Generate the client using the options above.

Related issues/PRs

I will send a PR

Suggest a fix/enhancement

Start by reproducing Feign client generation with the /customers/{customerEntity}-{customerNumber} path and the command-line configuration shown in the issue. Inspect the camel-case logic introduced by commit 2e8eea9c1832735babc7eb499bceaa3e43b79a51; done means the generated @RequestLine preserves the dash between both path variables.