Write a program detab that replaces tabs in the input with the proper number of blanks to space for the next tab stop

detab.c

#include <stdio.h>
#define MAXLINE 1000
#define TAB 8



int getlines(char line[], int maxline);
void detab(char line[], int array_size);


int main()
{
        char line[MAXLINE];
        int array_size;

        while(array_size = getlines(line, MAXLINE)){
                detab(line, array_size);
                printf("%s", line);


        }
}

int getlines(char line[], int maxline)
{
        int c, i;

        for(i = 0; i<maxline-1 && (getchar())!=EOF && c !='\n'; i++){
                line[i] = c;

        }
        line[i] = '\0';

        return i;

}
void detab(char line[], int array_size)
{
        int i;
        for(i=0; i<array_size; i++){
                if(line[i] == '\t'){
                        line[i] = "        ";

                }
        }
}