I am stuck on the following problem below, this is in C NOT C++, thank you in ad

Question

I am stuck on the following problem below, this is in C NOT C++, thank you in advance!

(Strings, Sorting) Prepare an input data file that contains 30 names. At least two of the names are identical. There is one name in each line in the following format:

Firstname Lastname

Write a program to read the names from the data file into an array. Each entry of the array should be a string in the following format:

Lastname, Firstname

Each name in the array must be unique.

Your program will display the names in the same way they are stored in the data file and in the last name-first name format in ascending alphabetical order. (Make sure this in C Programming not C++)

Explanation / Answer

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#include <stdio.h>
#include <conio.h>
#include <string.h>
int main()
{int i=0,j,k;
FILE *input;
char name[50][40],temp[50];
char first[20],last[20];
input = fopen("input.txt","r");
if(input == NULL)
{ printf("Error opening input file! ");
    return 0;
   }
printf("names as input ");
while(fscanf(input,"%s%s",&first,&last)>0)
    {printf("%s %s ",first,last);
        name[i][0]='';
    strcat(name[i],last);
    strcat(name[i],", ");
    strcat(name[i],first);
    i++;
    }
printf(" names sorted ");
for(j=0;j<i-1;j++)
    for(k=j+1;k<i;k++)
          {if(strcmp(name[j],name[k])>0)
              {strcpy(temp,name[j]);
               strcpy(name[j],name[k]);
               strcpy(name[k],temp);
              }
              }
for(j=0;j<i;j++)
    {printf("%s ",name[j]);
}
fclose(input);
                      
getch();
return 0;
       
}

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