refactoring: changed some variable names, made code more readable and enhanced some functions

src/mainMenu.c

@@ -1,62 +1,44 @@
 #include"mainMenu.h"
 
 
-bool agePermission(int age){
+bool agePermission(int age)
+{
 
-    if(age >= 18)
-    {
-
-       return true;
-
-    }
-
-    else
-    {
-
-       return false;
-
-    }
+    return age >= 18;
 
 }
 
-bool checkIfInteger(char* input){
-
-    char *end_pointer;
-
-    strtol(input, &end_pointer, 10);
-
-    if (end_pointer == input || *end_pointer != '\0')
-    {
+bool checkIfInteger(char* userInput)
+{
 
-        return false;
+    char *endPointer;
 
-    }
+    /*the endPointer points to the first non-integer character signaled to stop conversion*/
 
-    else
-    {
+    strtol(userInput, &endPointer, 10);
 
-        return true;
+    return !(endPointer == userInput || *endPointer != '\0');
 
-    }
 }
-void ageInput(){
+void ageInput()
+{
 
-    char input[20];
-    char* input_pointer;
+    char* userInput = malloc(20*sizeof(char*));
+    char* userInputPointer;
 
     long age;
 
     printf("\nPlease specify your age : ");
-    scanf("%s",input);
+    scanf("%s",userInput);
 
 
     while (true)
     {
-	age = strtol(input,&input_pointer,10);
+	age = strtol(userInput,&userInputPointer,10);
 
-        if(checkIfInteger(input) == true && agePermission(age)== true)
+        if((checkIfInteger(userInput))&& (agePermission(age)))
 	{
-	    age = strtol(input,&input_pointer,10);
+	    //age = strtol(userInput,&userInputPointer,10);
 
 	    printf("Access granted!\n\n\n\n");
 
@@ -66,7 +48,7 @@ void ageInput(){
 
 	}
 
-	else if(checkIfInteger(input) == true && agePermission(age)== false) 
+	else if((checkIfInteger(userInput)) && !(agePermission(age))) 
 	{
 
             printf("You should be at least 18 years old to create a bank account!\n");
@@ -79,7 +61,7 @@ void ageInput(){
 	{
 	    printf("input invalid! try again!\n");
 
-            scanf("%s",input);
+            scanf("%s",userInput);
 
 	}
     
@@ -88,7 +70,8 @@ void ageInput(){
 }
 
 
-void showMenu(){
+void showMenu()
+{
 
     printf("\t\t\t\t\t\t\t  Welcome to Bank Manager!");
     printf("\n\n\n\n\t\t\t\t\t\tPlease select one of the following functions!");