#include <stdio.h>
#include <string.h>
 
void reverseString_in_place(char* s);
 
int main(void) {
	char str[100];// your code goes here
 
	strcpy(str, "String reverse in-place demo");
	printf("Before string reverse : %s\n", str);
	reverseString_in_place(str);
	printf(" After string reverse : %s\n", str);
 
	return 0;
}
 
void reverseString_in_place(char* s) {
	char *p, *q, tmp;
 
	p = s; 
	q = s + strlen(s) - 1;
	while ( p <= q ) {
	    tmp = *p;
	    *p  = *q;
	    *q  = tmp;
	    p++;
	    q--;
	}
}
 

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