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

void normalize_path(char *buf)
{
    for (char* it = buf; *it != '\0'; ++it)
    {
        if (it[0] != '/' || it[0] == '/' && it[1] != '/')
        {
            *buf = *it;
            buf += 1;
        }
    }
    *buf = '\0';
}

int main()
{
    const char source[] = "";
    char* s = malloc(sizeof(source) / sizeof(char));
    strcpy(s, source);
    printf("Before:\n%s\n", s);
    normalize_path(s);
    printf("After:\n%s\n", s);
    getchar();
    free(s);
}