我目前正在尝试在C中实现setenv函数，该函数设置环境变量的值，我担心由于strdup而导致Valgrind标记的代码中的内存泄漏。我非常感谢您的见解，帮助我识别以下代码中的任何内存泄漏问题：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
extern char **environ;
int _setenv(const char *name, const char *value)
{
    char **new_environ, *current_env, *env_name;
    int count = 0, modified = 0, i = 0;
    
    /* Count the number of environment strings */
    while (environ[i])
    {
        count++;
        i++;
    }
    /* Create a copy of the environment variable */
    new_environ = malloc(sizeof(char *) * (count + 2));
    if (!new_environ)
    {
        perror("Memory Allocation Error");
        return (-1);
    }
    for (i = 0; i < count; i++)
    {
        current_env = strdup(environ[i]);
        env_name = strtok(current_env, "=");
        if (env_name != NULL && strcmp(env_name, name) == 0)
        {
            new_environ[count] = malloc(strlen(name) + strlen(value) + 2);
            if (new_environ[count])
            {
                sprintf(new_environ[count], "%s=%s", name, value);
                new_environ[count + 1] = NULL; /* Terminate the new array */
                modified = 0;
                free(current_env);
                break;
            }
        }
        else
        {
            new_environ[i] = current_env;
            modified = 1;
            free(current_env);
        }
    }
    if (!modified)
    {
        new_environ[count] = malloc(strlen(name) + strlen(value) + 2);
            if (new_environ[count])
            {
                sprintf(new_environ[count], "%s=%s", name, value);
                new_environ[count + 1] = NULL; /* Terminate the new array */
            }
    }
    else
    {
        new_environ[count] = NULL; /* Terminate the new array */
    }
    environ = new_environ;
    return (0);
}