How to include header file in sub directories

PlatformIO IDE
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1

I am trying to build the project which has many .h files and .cpp file
I made folder in Lib for each include

Project
|- lib
    |- Lib 1
        |- .h
        |- .cpp
    |- Lib 2
        |- .h
        |- .cpp
src
|- .ino

I am getting error on this specific Headers -
#include “src/modified/Streaming.h”
#include “src/fuel_gauge/max1720x_weng.h”

I tried to make an src file in Lib and it didn’t work
I tried to put the folders in src didn’t work

2

Don’t use .ino files! Write valid header (.h) and .cpp files.

Put your header files into “include” folder as described in the readme inside this folder.
Put your your implementation files (.cpp) into “src” and / or subfolders of ‘src’ like so:

.
├── include
│   ├── module1.h
│   ├── module2.h
│   └── module3.h
├── src
│   ├── module1
│   │   └── module1.cpp
│   ├── module2
│   │   └── module2.cpp
│   ├── module3
│   │   └── module3.cpp
│   └── main.cpp
└── platformio.ini

include/module1.h:

#pragma once

void function_from_module1();

include/module2.h:

#pragma once

void function_from_module2();

include/module3.h:

#pragma once

void function_from_module3();

src/module1/module1.cpp:

#include "module1.h"

#include <Arduino.h>

void function_from_module1() {
    Serial.println("This is 'function_from_module1()'");
}

src/module2/module2.cpp:

#include "module2.h"

#include <Arduino.h>

void function_from_module2() {
    Serial.println("This is 'function_from_module2()'");
}

src/module3/module3.cpp:

#include "module3.h"

#include <Arduino.h>

#include "module1.h"
#include "module2.h"

void function_from_module3() {
    Serial.println("This is 'function_from_module3' calling 'function_from_module1' and 'function_from_module2'");
    function_from_module1();
    function_from_module2();
}

src/main.cpp:

#include <Arduino.h>

#include "module1.h"
#include "module2.h"
#include "module3.h"

void setup() {
    Serial.begin(115200);

    function_from_module1();
    function_from_module2();
    function_from_module3();
}

void loop() {}
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