string - append or replace last char by dynamic number in C without libraries (avr-gcc) -

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i'm programming microcontroller , dynamically generate string.

basically desire following:

char * string = "app"; for(uint8_t i=0;i<max;i++){    char * newstring = app + i;    printf("%s \n",newstring); }

and should print app1, app2, app3, ... know there libraries manipulate strings, i'm working on microcontroller avr-gcc , keep code size minimal.

i've been messing around pointers , arrays, can't work.

edit: tried like:

    char * path = "application/app "; path[2]=(char) '1';  rest_activate_resource(&coap_app_res[coap_app_res_nb], path);

but prints "aplication/app " (without 2nd p).

to manipulate strings, first of strings must modifiable. string literals aren't modifiable.

the first example can implemented this:

char string[] = "appx"; /* x used placeholder */ for(uint8_t i=0;i<max;i++){    string[3] = + '0'; /* assign character x */    printf("%s \n",string); }

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