C program: Making a string palindrome

Develop a c code for the following function( using Pointer-function).

char Letter(char* [],n)

{

…………….

……………

…………….

}

Sample Input

4

abc

abcba

abcd

cba

Sample Output

2

0

4

2

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

void letter(char *s[], int n)

{

int i,l1,j,k,diff,c=0;

for(i=0;i<n;i++)

{

scanf("%s",s[i]);

l1=strlen(s[i])-1;

for(j=0;j<l1;j++,l1--)

{

diff=*(*(s+i)+j)-*(*(s+i)+l1);

c=c+abs(diff);

*(*(s+i)+l1)=*(*(s+i)+l1)+diff;

}

printf("%d\n",c);

puts(s[i]);

}

}

main()

{

  int T,i;

  char *s[10],s1[10];

  printf("enter the number of test cases");

  scanf("%d",&T);

  for(i=0;i<T;i++)

  s[i]=(char *)malloc(sizeof(s1));

  letter(s,T);

}