reverses a string of space-separated words terminated by newline

reverse_words.c

// reverses a string of space-separated words terminated by newline

#include <stdio.h>
#include <stdlib.h> 

void swap(char* arr, int i, int j){
	char t = arr[j];
	arr[j] = arr[i];
	arr[i] = t;
}

void string_reverse(char* arr, int s, int e){
	int l = s;
	int r = e;
	while(l<r){
		swap(arr,l,r);
		l++;r--;
	}
}

void word_reverser(char* arr){
	int len = 0;
	for(;arr[len]!='\n';len++);

	printf("%s:%d\n", "Input length",len);

	string_reverse(arr, 0, len-1);

	int i=0, j=0;
	for(i=0;i<len;){
		for(j=i;arr[j] != ' ' && j<len; j++)printf("%d\n", j);
	string_reverse(arr, i, j-1);
	i=j+1;
	}
}


int main(int argc, char const *argv[])
{
	printf("%s:", "Type in text");
	char inp[10000];
	fgets(inp, 10000, stdin);

	word_reverser(inp);

	printf("%s\n", inp);
	
	return 0;
}