Remove all blank spaces in a string

Write a C program to remove all the blank spaces from a string.

as example if string is "hello world , C programming" then the output will be "helloworld,Cprogramming"

	#include <stdio.h>
	#include <string.h>
	int main()
	{
	char input_string[100];char output_string[100];// two char arrays (two strings)
	printf("enter string with spaces\n");
	gets(input_string);// you can not use scanf() as it do not accept string with spaces
	int i=0;int j=0;
	while(input_string[i]!='\0')
	{
	if(input_string[i]!=' ')
	{
	output_string[j]=input_string[i];
	i++;
	j++;
	}
	else
	{
	i++;
	}
	}
	output_string[j]='\0';//terminate o/p string with null character
	printf("input string without spaces \n");
	puts(output_string);
	return 0;
	}

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