How can I stop a blank/tab from being outputted if there is a blank/tab before?

I’m using K&R’s “The C Programming Language” and was currently doing Exercise 1-12. The problem is not in resolving the exercise, but in trying to resolve one of the bugs that arise from it.

My solution.

#include <stdio.h>

int main(void)
{
    int c;
    
    while ((c = getchar()) != EOF)
    {
        if (c == ' ' || c == '\t')
        {
            printf("\n");
        }
        else
        {
            putchar(c);
        }
    }
}

Problematic output

bash >>> ./Exercises/ex12
hello  everyone
hello
 
everyone

I tried solving it based on Ex 1-9, but no luck.

#include <stdio.h>
#define PREVCHAR 'a'

int main(void)
{
    int c, prevc = PREVCHAR;
    
    while ((c = getchar()) != EOF)
    {
    if (c == ' ' && prevc == ' ')
    {
        printf("");
    }
        else if (c == ' ' && prevc != ' ')
        {
            printf("\n");
        }
    else
    {
            putchar(c);
    }
    }
}

I’m starting to think that I’m not equipped to solve this "bug" with what I know. Maybe I need to store the input with extra blanks or tabs removed and then output the blanks or tabs with tabs. But that seems comboluted.

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