Uninitialized variables, basic javascript

Tell us what’s happening:
not sure what i’m doing wrong

Your code so far
var a = 5;
var b = 10;
var c = " I am a";

// 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!";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18363.

Challenge: Understanding Uninitialized Variables

Link to the challenge:

Your capitalization in c does not match the requested capitalization.

The challenges are case sensitive and spelling counts, found that out the hard way. Sometime we overlook the problems.

c = c + " string!";