Text Replace Function in C

#include <stdio.h>
#include <string.h>
#define MAX_LEN_SINGLE_LINE     150
void main(char argc[6])
{
    printf("Version is %s\n", version);
    const char fileOrig[32] = "work.xml";
    const char fileRepl[32] = "work.xml";
    const char text2find[80] = "<Version>000000</Version>";
    const char text2repl[80] = "<Version>000001</Version>";
    char buffer[MAX_LEN_SINGLE_LINE+2];
    char *buff_ptr, *find_ptr;
    FILE *fp1, *fp2;
    size_t find_len = strlen(text2find);
    fp1 = fopen(fileOrig,"r");
    fp2 = fopen(fileRepl,"w");
    while(fgets(buffer,MAX_LEN_SINGLE_LINE+2,fp1))
    {
        buff_ptr = buffer;
        while ((find_ptr = strstr(buff_ptr,text2find)))
        {
            while(buff_ptr < find_ptr)
                fputc((int)*buff_ptr++,fp2);
            fputs(text2repl,fp2);
            buff_ptr += find_len;
        }
        fputs(buff_ptr,fp2);
    }
    fclose(fp2);
    fclose(fp1);
    printf("Done!\n");
}