use heck to force camel case format on Visitor ident

issue #77

yaserde_derive/Cargo.toml

@@ -12,6 +12,7 @@ readme = "../README.md"
 edition = "2018"
 
 [dependencies]
+heck = "0.3.1"
 syn = { version = "~1.0", features = ["visit", "extra-traits"] }
 proc-macro2 = "~1.0"
 quote = "~1.0"

yaserde_derive/src/common/field.rs

@@ -1,4 +1,5 @@
 use crate::common::attribute::YaSerdeAttribute;
+use heck::CamelCase;
 use proc_macro2::Span;
 use proc_macro2::{Ident, TokenStream};
 use std::fmt;
@@ -84,7 +85,7 @@ impl YaSerdeField {
     );
 
     Ident::new(
-      &format!("__Visitor_{}_{}", label.replace(".", "_"), struct_id),
+      &format!("__Visitor_{}_{}", label.replace(".", "_").to_camel_case(), struct_id),
       self.get_span(),
     )
   }

yaserde_derive/src/de/expand_struct.rs

@@ -1,5 +1,6 @@
 use crate::common::{Field, YaSerdeAttribute, YaSerdeField};
 use crate::de::build_default_value::build_default_value;
+use heck::CamelCase;
 use proc_macro2::{Span, TokenStream};
 use syn::{DataStruct, Ident};
 
@@ -447,7 +448,7 @@ fn build_visitor_ident(label: &str, span: Span, struct_name: Option<&syn::Path>)
   );
 
   Ident::new(
-    &format!("__Visitor_{}_{}", label.replace(".", "_"), struct_id),
+    &format!("__Visitor_{}_{}", label.replace(".", "_").to_camel_case(), struct_id),
     span,
   )
 }