Do not pollute the header with examplevm_create()

examples/capi.c

@@ -1,9 +1,12 @@
+#include <evm.h>
+
 #include <inttypes.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include "evm.h"
 
+/// Prototype from examplevm.c
+struct evm_instance* examplevm_create(void);
 
 struct evm_uint256be balance(struct evm_context* context,
                              const struct evm_address* address)

examples/examplevm.c

@@ -5,7 +5,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-
 struct examplevm
 {
     struct evm_instance instance;

include/evm.h

@@ -519,7 +519,8 @@ struct evm_instance {
 /// The function SHOULD be named `<vm-name>_create(void)`.
 ///
 /// @return  EVM instance or NULL indicating instance creation failure.
-struct evm_instance* examplevm_create(void);
+///
+/// struct evm_instance* examplevm_create(void);
 
 
 #if __cplusplus