for(int i=0; a[i]!='\0' && b[i]!='\0'; i++) { char c; if(a[i]>b[i]) { c=a[i]; a[i]=b[i]; b[i]=c; } }}
int i = 0; while(a[i] != '\0' && b[i] != '\0') { if (a[i] > b[i}) { char temp = a[i]; a[i] = b[i]; b[i] = temp; } i++ }}
void sort_chars(char *a, char *b){ for(int i=0; a[i]!='\0' && b[i]!='\0'; i++){ char temp; if(a[i] > b[i]){ temp = a[i]; a[i] = b[i]; b[i] = temp; } } }
int i = 0; char temp = a[i]; if( a == NULL || b == NULL){ print("error"); return; } while (a[i] != '\0'){ if(a[i] > b[i]){ temp = a[i]; a[i] = b[i]; b[i] = temp; } i++; }}
int i = 0; char temp;
while(a[i] != '\0' && b[i] != '\0'){ if(a[i] > b[i]){ temp = b[i]; b[i] = a[i]; a[i] = temp; } i++; }}
char tempb;
while(a[i] != '\0' && b[i] != '\0'){ if(a[i] < b[i]){
tempa = a[i]; tempb = b[i]; a[i] = tempb; b[i] = tempa; }
}}