What is wrong with this i can't see any error?

[123amini]

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

// Only change code below this line
var a;
var b;
var c;
// Only change code above this line

a = a + 1;
b = b + 5;
c = c + " String!";

var a = 6;
var b = 15;
var c = "I am a string!";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Challenge: Understanding Uninitialized Variables

Link to the challenge:

freeCodeCamp.org

[123amini]

please help me i can’t see what is wrong !!!

[surajkushvaha]

// Only change code below this line

var a=5;

var b=10;

var c=“I am a”;

// Only change code above this line

a = a + 1;

b = b + 5;

c = c + " String!";

try it.
you define the variable two times.

[123amini]

it’s not working show me the way

[surajkushvaha]

[123amini]

thank you l have seen it