Modification of the function customerChoiceForMenuItem(). Change void to int. This function now has a return value. Each return value has a meaning. The meaning of the return value lies in the user's choice for a menu item.

src/customerMenu.c

@@ -1,27 +1,34 @@
 #include "customerMenu.h"
 
-void customerChoiceForMenuItem(int numberOfMenuItem)
+int customerChoiceForMenuItem(int numberOfMenuItem)
 {
+	int returnStatus = 0;
 	switch(numberOfMenuItem){
 		case 1:
 			puts("You have chosen to send money.\n");
+			returnStatus = 1;
 			//call sendMoney();
 			break;
 		case 2:
 			puts("You have chosen to withdraw money.\n");
+			returnStatus = 2;
 			//call withDrawMoney();
 			break;
 		case 3:
 			puts("You have chosen to deposit money.\n");
+			returnStatus = 3;
 			//call depositMoney();
 			break;
 		case 4:
 			puts("You have chosen to request a loan.\n");
+			returnStatus = 4;
 			//call requestLoan();
 			break;
 		default:
-			puts("Invalid input.\n");
+			puts("Invalid input.");
+			returnStatus = -1;
 	}
+	return returnStatus;
 }
 
 void showAllMenuEntries()

src/customerMenu.h

@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "customerProperties.h"
-void customerChoiceForMenuItem(int);
+int customerChoiceForMenuItem(int);
 void showAllMenuEntries();
 void menu(customer_t *);