refactoring: realigned code

src/main.c

@@ -6,12 +6,15 @@ char buffer[100];
 
 int main() {
     printf("Please enter the id of a specific operation...\n1. addition\n2. subtraction\n3. multiplication\n4. division\n");
+
     int input;
     scanf("%d", &input);
+
     if(!checkOperationInput(input)) {
         printf("Invalid operation id\n");
         return 0;
     }
+
     printf("\nPlease enter the first and the second number separated by a space...\n");
 
     while(fgets(buffer, 100, stdin)) {
@@ -22,6 +25,7 @@ int main() {
     }
 
     int* result = evaluateInput(buffer, input);
+
     if(result == NULL) {
         printf("\nInvalid formatting. Two numbers need to be separated by a space\n");
         return 0;