Generated project is not working when there are digits in the name

[77409]

Describe the bug
当创建的项目名字中包含数字（Have numbers in project name）时，如：e4ting、do1thing，示例代码无法运行，生成的代码大小写是混乱的。
主要体现在：数字后的第一个字母的大小写看起来是随机的。

To Reproduce
Steps to reproduce the behavior, if applicable:

1. The code is

   goctl rpc new e4ting
   cd e4ting
   go  build -o test e4ting.go  

2. The error is

    internal/server/e4tingserver.go:16:9: undefined: e4ting.UnimplementedE4tingServer
    ./e4ting.go:29:50: undefined: server.NewE4TingServer
   

   // e4ting_grpc.pb.go 中  4 后面的字母t是大写（Upper）的
   type UnimplementedE4TingServer struct {
   }
   // e4tingserver.go 中  4 后面的字母t是小写（Lower）的
   func NewE4tingServer(svcCtx *svc.ServiceContext) *E4tingServer {
       return &E4tingServer{
   	    svcCtx: svcCtx,
       }
   }

Expected behavior
全英文时，是不会出现上面的报错的.

Screenshots

Environments (please complete the following information):

• OS: Linux
• goctl version 1.6.3

More description
.

[kesonan]

thanks, I'll fix it.

[kevwan]

fixed by #4032