Patrones

// gcc -o patrones patrones.c -std=c99
#include <stdio.h>
#include <string.h>

#define PATRONES 41

void patronA (char * s){
        void* address= s+10;
        while (  (void*)s++ <address){if (*s!='*') {*s='*'; break;}}
};

void patronB (char * s){
        void* address= s;
        s+=11;
        while (  (void*)s-- >address) {if (*s!=' ') {*s=' '; break;}}
};

void patronC (char * s){
        void* address= s+10;
        do{if (*s!=' ') {*s=' '; break;}}while (  (void*)s++ <address);
};

void patronD (char * s){
        void* address= s;
        s+=11;
       do{if (*s!='*') {*s='*'; break;}} while (  (void*)s-- >address) ;
};

int main (){
    char cadena []={"           "};

    for (int i=0;i<PATRONES;i++)
    {

        if (i<10) {patronA (cadena);}
        if (i>=11 && i<20) {patronB (cadena);}

        if (i==21) {memset (cadena,'*',sizeof (cadena));}//Llena de * para patron C

        if (i>=21 && i<32) {patronC (cadena);}
        if (i>=32) {patronD(cadena);}

        printf ("%s \n",cadena);
    }
        return 0;
};