<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def find_exe(env_dir, name):
 """Finds a exe with that name in the environment path"""


    if platform.system() == "Windows":
        name = name + ".exe"

    # find the binary
    exe_name = os.path.join(env_dir, name)
    if not os.path.exists(exe_name):
        exe_name = os.path.join(env_dir, "bin", name)
        if not os.path.exists(exe_name):
            exe_name = os.path.join(env_dir, "Scripts", name)
            if not os.path.exists(exe_name):
                return None
    return exe_name