Eroare Inlocuire CR LF din string

#include <stdio.h>
#include <string.h>

// Cerinta: Inlocuieste \r\n din char cu \n. Adica, AT+CIMI\r\n\r\n226030162588370\r\n\r\nOK\r\n
// trebuie sa devina cumva AT+CIMI\n226030162588370\nOK\n
// Codul transforma AT+CIMI\r\n\r\n226030162588370\r\n\r\nOK\r\n in AT+CIMI\r\n\r\n226030162588370\r\n\r\nOK\r\n
// si nu am nevoie de asta...
int main (void) {
    char at[] = "AT+CIMI\r\n\r\n226030162588370\r\n\r\nOK\r\n";  // My AT Command and response

    // Replacer...
    char *source, *destination;
    for (source = destination = at; *source != '\0'; source++) {
        *destination = *source;
        if (*destination != '\r' && *destination != '\n') {
            destination++;
        }
    }
    *destination = '\0';  //make me a great 'string' again

    printf("%s", at); // printf the 'string'...
}