my esp8266 is printing out a ton of gibberish - arduino

Question

my esp8266 seems to be printing out a ton of memory locations to the serial monitor on arduino. my code mainly takes a post request from an android app and uses the string to execute respective blocks of code like setting and entering password.
this is my code
*i initialized some declarations for testing so i dont have to use my android phone and can just test my functions by setting variables.
#include <base64.h>
#include <xbase64.h>
#include <AES.h>
#include <AESLib.h>
#include <AES_config.h>
#include <base64.h>
#include <ESP8266WebServer.h>
#include <Servo.h>
#include <Keypad.h>
#define SOUND_VELOCITY 0.034
#define CM_TO_INCH 0.393701
const byte ROWS = 3;
const byte COLS = 3;
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'}
};
byte rowPins[ROWS] = { D3, D2, D1};
byte colPins[COLS] = { D7, D6, D5};
const char* ssid = "ESP8266-AP";
const char* passwordd = "password";
const int trigPin=D4;
const int echoPin=D0;
const float DISTANCE_THRESHOLD = 20;
long duration;
float distanceCm;
float distanceInch;
String tempString;
String pass;
char keyp;
String newString = "1020"; //change to 0102 to test other case
Keypad pad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String password = "0000"; //variable to store the password, default=0000
String input = ""; //variable to store the input
bool setPass = false; //variable to track if the user is setting the password
bool passwordSet = false; //variable to track if the password has been set
bool unlocked = false; //variable to track if the system is unlocked
bool doorOpen = false;
bool isPostHandled = true;
int openClose = 0;
const byte key[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };
ESP8266WebServer server(80);
AES aes;
Servo myservo;
void handlePost() {
String val = server.arg("data");
int decodedLength = base64_dec_len(val.c_str(), val.length());
char decodedData[decodedLength];
base64_decode(decodedData, val.c_str(), val.length());
byte decrypted[decodedLength];
aes.set_key(key, sizeof(key));
aes.decrypt((byte*)decodedData, decrypted);
String decryptedVal = String((char*)decrypted);
for(int i=0; i<4; i++){
tempString[i]=decryptedVal[i];
}
newString = String(tempString);
//Serial.println("Encrypted value: " + val);
//Serial.println("Decrypted value: " + decryptedVal);
server.send(200, "text/plain", "Value Received");
isPostHandled = true;
}
/*void moveServo() {
myservo.write(0);
delay(1000);
int count = 0;
myservo.write(180);
} */
//move servo, pass argument to control degrees
void moveServo(int position) {
myservo.write(position);
delay(1000);
}
float calculateDistance() {
// Trigger the ultrasonic sensor
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
// Measure the echo return time and calculate the distance
duration = pulseIn(echoPin, HIGH);
float distanceCm = (duration / 2) * SOUND_VELOCITY;
float distanceInch = distanceCm * CM_TO_INCH;
return distanceInch;
}
void setup() {
float duration, distanceCm, distanceInch;
//esp declaration
Serial.begin(9600);
WiFi.mode(WIFI_AP);
WiFi.softAP(ssid, passwordd);
server.begin();
server.on("/post", HTTP_POST, handlePost);
Serial.println("Server started");
//servo motor declaration
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
myservo.attach(D8);
myservo.write(180); // set the servo to 0 degrees
}
void loop() {
server.handleClient();
float distance = calculateDistance();
if((distance < 20) && (openClose == 0)){
doorOpen = true;
}
if ((distance < 20) && (openClose == 1)) {
doorOpen = false;
}
if(isPostHandled){
if(newString == "0102"){
do{
password = ""; //set password to a null string
Serial.println("Please set 4 digit passcode");
for(int i=0; i<4; i++){
keyp = pad.getKey();
if (keyp != NO_KEY) {
password += keyp; //add the key press to the password
Serial.print("*"); //print a * to indicate a key press
}
if (password.length() == 4) { //if the password is the same length as desired
Serial.println("Password set: " + password);
passwordSet = true;
moveServo(0);
break;
}
}
}while(!passwordSet);
newString = "";
}
else if(newString == "1020"){
input = "";
Serial.println("Please enter passcode");
do{
for(int i=0; i<4; i++){
keyp = pad.getKey();
if (keyp != NO_KEY) {
input += keyp; //add the key press to the input
Serial.print("*"); //print a * to indicate a key press
}
}
}while(!unlocked && (input.length() != 4));
if (input == password) { //if the input is the same length as the password
delay(1000);
Serial.println("Unlocked");
moveServo(0); //unlock
unlocked = true;
}else{
Serial.println("Access Denied, Wrong password");
return;
}
}
}
else{
Serial.print("isPostHandled = false");
return;
}
}
and this is the output
3fffff40: 00000000 00001113 39999999 0013be3a
3fffff50: 3ffe8a32 fffffffc 3fff019c 3ffefe98
3fffff60: 3ffeffc0 00000002 3ffefeb0 40205875
3fffff70: 3fffdad0 00000002 3ffefeb0 402058be
3fffff80: 3fffdad0 00000000 3fff001c 40203919
3fffff90: 3ffefc68 3ffefff8 00000001 40205522
3fffffa0: 00000000 00000000 3ffefc68 3fff0108
3fffffb0: 3fffdad0 00000000 3fff00dc 40208560
3fffffc0: feefeffe feefeffe 3fffdab0 401012b9
<<<stack<<<
--------------- CUT HERE FOR EXCEPTION DECODER ---------------
���u�����Server started
Please enter passcode
i tried changing serial baud rate and i cant really find anything related to what i am facing on the internet