Added operation handler output function

src/operationHandler.c

@@ -3,6 +3,7 @@
 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 // checking integer input as operation id
 bool checkOperationInput(int input) {
@@ -95,3 +96,7 @@ int extractFirstNumber(char* str) {
 
     return number;
 }
+
+void outputInteger(int output) {
+    printf("Result: %d", output);
+}