Refactor insterest calculator, remove unncessary files

src/interestCalculator.c

@@ -23,22 +23,19 @@ void calculateYearlyInterest(){
     float timeInYears;
 
     printf("Please enter the principal amount:");
-    scanf("%f",&principalAmount);
-    if(principalAmount<=0){
+    if (scanf("%f", &principalAmount) != 1 || principalAmount <= 0) {
         troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest per year (percentage):");
-    scanf("%f",&interestPerYear);
-    if(interestPerYear<=0){
-        troubleshoot(1);
+    if (scanf("%f", &interestPerYear) != 1 || interestPerYear <= 0) {
+        troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest time in years:");
-    scanf("%f",&timeInYears);
-    if(timeInYears<=0){
+    if (scanf("%f", &timeInYears) != 1 || timeInYears <= 0) {
         troubleshoot(2);
         return;
     }
@@ -46,7 +43,7 @@ void calculateYearlyInterest(){
     float interestDecimal=interestPerYear/100;
 
     float result= principalAmount*(1+(interestDecimal*timeInYears));
-    printf("\nAmount with the interest is %.2f.",result);
+    printf("\nAmount with the interest is %.2f€.",result);
 }
 void calculateMonthlyInterest(){
     float principalAmount;
@@ -54,22 +51,19 @@ void calculateMonthlyInterest(){
     float timeInMonths;
 
     printf("Please enter the principal amount:");
-    scanf("%f",&principalAmount);
-    if(principalAmount<=0){
+   if (scanf("%f", &principalAmount) != 1 || principalAmount <= 0) {
         troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest per month (percentage):");
-    scanf("%f",&interestPerMonth);
-    if(interestPerMonth<=0){
-        troubleshoot(1);
+    if (scanf("%f", &interestPerMonth) != 1 || interestPerMonth <= 0) {
+        troubleshoot(0);
         return;
     }
 
     printf("\nPlease enter interest time in months:");
-    scanf("%f",&timeInMonths);
-    if(timeInMonths<=0){
+    if (scanf("%f", &timeInMonths) != 1 || timeInMonths <= 0) {
         troubleshoot(2);
         return;
     }
@@ -77,7 +71,7 @@ void calculateMonthlyInterest(){
     float interestDecimal=interestPerMonth/100;
 
     float result= principalAmount*(1+(interestDecimal*timeInMonths));
-    printf("\nAmount with the interest is %.2f.",result);
+    printf("\nAmount with the interest is %.2f€.",result);
 }
 
 void initiateCalculator(){