Use fprintf instead of printf.

library/src/configuration.cpp

@@ -23,12 +23,12 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 	{
 		if (cfg == nullptr)
 		{
-			printf("TariffConfiguration pointer not set\n");
+            fprintf(stderr, "TariffConfiguration pointer not set\n");
 			return false;
 		}
 		if (json == NULL)
 		{
-			printf("%s", "Input JSON string is NULL\n");
+            fprintf(stderr, "%s", "Input JSON string is NULL\n");
 			return false;
 		}
 
@@ -40,17 +40,17 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 		ParseErrorCode err = document.GetParseError();
 		if (err != 0)
 		{
-			printf("%s %d (%s)\n", "Unable to parse JSON, error code:", err, GetParseError_En(err));
+            fprintf(stderr, "%s %d (%s)\n", "Unable to parse JSON, error code:", err, GetParseError_En(err));
 			return false;
 		}
 
 		// Validate JSON, check if it's a JSON object
-		printf("%s", "JSON parsing has been successful\n");
+        fprintf(stderr, "%s", "JSON parsing has been successful\n");
 		if (!document.IsObject()) {
-			printf("%s", "Error: not a (valid) JSON object\n");
+            fprintf(stderr, "%s", "Error: not a (valid) JSON object\n");
 			return false;
 		}
-		printf("%s", "Valid JSON object identified\n");
+        fprintf(stderr, "%s", "Valid JSON object identified\n");
 
 		// Validate JSON, check configuration members
 		if (!document.HasMember("Currency")
@@ -65,7 +65,7 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 			printf("%s", "Error: not a valid configuration JSON\n");
 			return false;
 		}
-		printf("%s", "Valid JSON configuration identified\n");
+        fprintf(stderr, "%s", "Valid JSON configuration identified\n");
 
 		ATBCurrency Currency;
 		ATBDuration Duration;
@@ -115,7 +115,7 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 					const char* inner_obj_name = k->name.GetString();
 					if (inner_obj_name == NULL)
 					{
-						printf("Inner object name is NULL\n");
+                        fprintf(stderr, "Inner object name is NULL\n");
 						continue;
 					}
 
@@ -240,7 +240,7 @@ bool Configuration::ParseJson(Configuration* cfg, const char* json)
 		return true;
 	}
 	catch (...) {
-		printf("%s\n", "General exception has occurred while parsing JSON\n");
+        fprintf(stderr, "%s\n", "General exception has occurred while parsing JSON\n");
 		return false;
 	}
 }