fix(abigen): support functions with different casing (#972)

ethers-contract/ethers-contract-abigen/src/contract/methods.rs

@@ -342,7 +342,7 @@ impl Context {
         let mut all_functions = HashMap::new();
         for function in self.abi.functions() {
             all_functions
-                .entry(function.name.to_lowercase())
+                .entry(util::safe_snake_case_ident(&function.name))
                 .or_insert_with(Vec::new)
                 .push(function);
         }

ethers-contract/tests/abigen.rs

@@ -427,6 +427,23 @@ fn can_generate_nested_types() {
     assert_eq!(call, decoded_call);
 }
 
+#[test]
+fn can_handle_different_calls() {
+    abigen!(
+        Test,
+        r#"[
+        function fooBar()
+        function FOO_BAR()
+    ]"#,
+    );
+
+    let (client, _mock) = Provider::mocked();
+    let contract = Test::new(Address::default(), Arc::new(client));
+
+    let _ = contract.fooBar();
+    let _ = contract.FOO_BAR();
+}
+
 #[test]
 fn can_handle_case_sensitive_calls() {
     abigen!(