swag init with --instanceName generates invalid variable

[Syuparn]

Describe the bug
A clear and concise description of what the bug is.

When swag init is executed with --instanceName, it generates invalid variable and compile error is raised

To Reproduce

Steps to reproduce the behavior:

1. clone this repository
2. run swag init --instanceName foo in sample project example/basic/

Expected behavior

swag generates variable SwaggerInfo_foo .

Screenshots
If applicable, add screenshots to help explain your problem.

Complie error is raised because SwaggerInfo variable is split into 2 tokens as below

// SwaggerInfo_foo holds exported Swagger Info so clients can modify it
var SwaggerInfo _foo = &swag.Spec{
	Version:          "1.0",
	Host:             "petstore.swagger.io",
	BasePath:         "/v2",
	Schemes:          []string{},
	Title:            "Swagger Example API",
	Description:      "This is a sample server Petstore server.",
	InfoInstanceName: "foo",
	SwaggerTemplate:  docTemplate_foo,
}

Your swag version
e.g. v1.7.9-p1

Your go version
e.g. 1.17.6

Desktop (please complete the following information):

• OS: Ubuntu 20.04

[ubogdan]

I believe this can be closed since it was released with v1.8.0.

[Syuparn]

I tried swag init --instanceName foo in v1.8.0 and it generates a valid variable var SwaggerInfofoo. Thank you so much!