progrom for converting time from 12 hr format to 24 hr format

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    char* time = (char *)malloc(10240 * sizeof(char));
    scanf("%s",time);
    int count = 0;
   
    int hh = (time[0] - '0') * 10 + (time[1] - '0');
    for(int i=0;i < 10240;i++) {
        if ((time[i] == 'P' || time[i] == 'p') && (time[i+1] == 'M' || time[i+1] =='m')) {
            if (hh > 11) break;
            if (hh == 24 )
                hh = 0;
            else
                hh+=12;
            break;
        }
        if ((time[i] == 'A'  || time[i+1] =='a') && (time[i+1] == 'M' || time[i+1] =='m')) {
            if (hh > 11) hh = 0;
            break;
        }
        if (time[i] == '\0') {
            break;
        }
        count++;
    }

    time[0] = hh/10 + '0';
    time[1] = hh%10 + '0';

    char* newTime = (char*) malloc(count* sizeof (char));
    strncpy(newTime, time, count);
        printf("%s", newTime);
    return 0;
}