diff --git a/main.c b/main.c
index 3ca303f..0badbd9 100644
--- a/main.c
+++ b/main.c
@@ -17,17 +17,17 @@ char* manipulate_str(double input);
 
 int main(const int argc, char *argv[]) {
     const double res = calculate(parse_input(argc, argv));
-    //manipulate string by cutting of trailing zeros
-    char* final_string = manipulate_str(res);
 
+    char* final_string = manipulate_str(res);
     printf("%s %s %s = %s\n", argv[1], argv[2], argv[3], final_string);
+
     free(final_string);
     return 0;
 }
 
 CalcStr parse_input(const int n, char *argv[]) {
     if (n < 4) {
-        perror("Insuficient arguments (3 are required), exiting");
+        fprintf(stderr, "Insuficient arguments (3 are required), exiting...\n");
         exit(EXIT_FAILURE);
     }
 
@@ -63,7 +63,7 @@ double calculate(const CalcStr calc) {
             return calc.first + calc.second;
         case '-':
             return calc.first - calc.second;
-        case '*':
+        case 'x':
             return calc.first * calc.second;
         case '/':
             return calc.first / calc.second;
@@ -77,7 +77,7 @@ double calculate(const CalcStr calc) {
 
             return r;
         default:
-            perror("Invalid operand type");
+            fprintf(stderr, "Invalid operand type\n");
             exit(EXIT_FAILURE);
     }
 }