What is wrong with this code in the beginner java course? I have done this for two days and it still doesn't work

Tell us what’s happening:

Your code so far

// Initialize these three variables

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

// Do not change code below this line

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

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Link to the challenge:

You’ve initialized c to the wrong value. It should be "I am a", not "I am a string!".