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#include <string.h>
#include <stdlib.h>
 
 
int main ()
{
    int z=0,n=0,i=0,j=0,o=0,k=0,l=0;
    char t[20000][31];
    char v[31];
    char s[31];
 
 
    scanf ("%d",&z);
 
    for (l=1;l<=z;l++)
    {
 
        scanf ("%d\n",&n);
 
        for (j=0;j<=n-1;j++)
        {
            scanf ("%s",t[j]);
            strlwr(t[j]);
        }
 
 
 
 
    for (j=0;j<=n-1;j++)
    {
        k=0;
        strcpy(v,t[j]);
        for (i=j+1;i<=n-1;i++)
        {
          if (strcmp (t[i],v)<0)
          {
          strcpy(v,t[i]);
          k=i;
          }
        }
        if (k>0)
        {
        strcpy (s,t[j]);
        strcpy (t[j],v);
        strcpy (t[k],s);
        }
    }
 
 
 
 
        for (j=0;j<=n-1;j++)
        {
            printf ("%s ",t[j]); 
        }        
printf ("\n");
}   
return 0;
}

prog.c: In function ‘main’:
prog.c:13: warning: implicit declaration of function ‘scanf’
prog.c:13: warning: incompatible implicit declaration of built-in function ‘scanf’
prog.c:23: warning: implicit declaration of function ‘strlwr’
prog.c:54: warning: implicit declaration of function ‘printf’
prog.c:54: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:56: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:7: warning: unused variable ‘o’
/home/9q2J5a/ccZDUTUg.o: In function `main':
prog.c:(.text+0xa2): undefined reference to `strlwr'
collect2: ld returned 1 exit status

Standard output is empty