My code for parking

/* Pre-Processor Directive */

#include <stdio.h>
#include <stdbool.h>

#define DISCOUNT_TIME_3    3
#define DISCOUNT_TIME_10  10
#define DISCOUNT_RATE_0.2  0.2
#define DISCOUNT_RATE_0.4  0.4

/* Function Prototypes */

int inputParkingtime
int validateParkingtime
int
char inputVehicaltype
float validateVehicaltype
float calcParkingfee
float showParkingfee (

/* Main Function */

int main (void)
{

  printf("Invalid Vehical Type\n");


  return (0)

}

/* User Defined Functions */

/* Input Parking Time */

int inputParkingtime
{
   printf("Enter Parking Time: \n");
   scanf("%d", &inputParkingtime);

   return (0)
}

/* Validate Parking Time */
int validateParkingtime (int inputParkingtime)
{
  int parkingTime;

   if ( inputParkingtime <= 0 )
      printf("Wrong Parking Time \n");
   else if ( inputParkingtime > 24 )
      printf("Parking Time is Limited To 24 Hours\n);
   else if ( inputParkingtime > 3 ) && ( inputParkingtime < 10 )
      parkingTime = inputParkingtime * DISCOUNT_RATE_0.2
   else if ( inputParkingtime >= 10 ) && ( inputParkingtime < 25 )
      parkingTime = inputParkingtime * DISCOUNT_RATE_0.4
   else
      parkingTime = inputParkingtime

   return
}


/* Rejection of Vehical Type */
  char invalidVehicaltype
{

   printf("Invalid Vehical Type");

}
/* Input vehical Type */
char inputVehicaltype
{
   printf("Enter Your Vehical Type (C, M or T): \n);
   scanf("%c", &inputVehicaltype);

   printf("Invalid Vehical Type");
   return
}

/* Validate Vehical Type */
float validateVehicaltype (char inputVehicaltype)
{
   if ( inputVehicaltype == C ) || ( inputVehicaltype == c )
      validateVehicaltype = 3.5
   else if ( inputVehicaltype == M ) || ( inputVehicaltype == m )
      validateVehicaltype = 1.5
   else if ( inputVehicaltype == T ) || ( inputVehicaltype == t )
      validateVehicaltype = 8.0
   else

      return ()
}

/* Calculate Parking Fee */
float calcParkingfee (int parkingTime, float validateVehicaltype)
{

   calcParkingfee = parkingTime * validateVehicaltype

   return ()
}

/* Show Parking Fee With 'float' Precision, to Two Decimal Places */
float showParkingfee (char inputVehicaltype, int validateParkingtime, float calcParkingtime)
{
   printf("%c, %d hrs Parking Fee: $%f\n");

}