Directories constructed as a tree in C

#include<stdio.h>
#include <string.h>
int main()
{
 /*The output file*/
FILE *fo;

/*The input file*/
FILE *fi;

/*The current character we are on*/
char c[2];
c[1]=0;

/*The array to build the word we are on*/
char *s=malloc(900000);

/* Opens the file for reading */
fi=fopen("d.txt","r");
c[0]=getc(fi);
/* While loop responsible for reading current character,
 creating the string of directories linked to that character
 , and placing the word at the end*/
while(c[0]!=EOF)
{
strcat(s,"lib\\");
/*While loop that checks the current char for a space or a newline*/
    while((c[0]!=' '&&c[0]!='\n'))
    {


       strcat(s,c);

    strcat(s,"\\");
 c[0]=getc(fi);
    }
    printf(s);
    /*Makes the directory following the string of characters (IE: Character would be c\h\a\r\a\c\t\e\r)*/
    mkdir(s);

    s=malloc(9000);
c[0]=getc(fi);

}


return 0;
}

The new problem that I am encountering is most likely due to my allocation of memory, as when I get to the printf statement that prints out the composed string, I get lib\a\a\r\d\v\a\r\k\% where the % sign represents any ascii character, selected at random(probably due to some data that was at the ending of the string). How do I fix this problem?

IS DIS THRED, A FUCKIN JOKE?

UR SHITTY CODE DISGRACES  ME, IT DISGRACES DEANIS RICKY, AND IT'S SO BAD THAT IT DISGRACES EVEN ALL DA STUPID, BRAIN-DEAD INDIANS WHO USE TURBO C AND READ "LET US C" BY YASHAVANT KANETKAR.

I DON'T GO INTO UR CESS POOLS AND START KICKING UR SHIT AROUND, SO DON'T COME TO MY BOARD AND POST DISGRACEFUL C CODE. U KEEP THIS SHIT UP AND I'M GONNA POUR WATER INTO UR CESS POOLS SO U RETARDS HAVE NOTHING TO PLAY WITH.

NOW GET DA FUCK OUT OF MY THRED AND DON'T COME BACK TILL U CAN EXPLAIN TO ME, IN DETAIL, DA RETURN VALUES OF realloc, getc, AND fopen.